Fix empty/garbage imports on Altium Designer 25 (.NET 6 host + invariant-culture parsing)

[AdiVacaru]

On Altium Designer 25 the extension registers and shows its menu, but every import produces an empty or garbage footprint. This PR fixes the two root causes and several smaller bugs found while debugging them.

Root causes

1. AD25 hosts extensions on .NET 6, not .NET Framework

Altium.SDK.dll shipped with AD25 targets .NETCoreApp,Version=v6.0. The plugin was built for net48, and under the .NET 6 host the 2D-primitive interop calls (CreateTrack, CreatePad, …) fail silently — the importer runs to completion but nothing is placed. Retargeting the project to net6.0-windows fixes it.

Compatibility tradeoff: a net6.0-windows build will no longer load on AD24 and older, which host extensions on .NET Framework. I'm happy to rework this into dual-targeting (net48 + net6.0-windows, producing two output DLLs) if you'd prefer to keep older versions supported — let me know which way you want to go. This likely also explains #5: AD26 registers the extension but shows no menu, which is the same load-failure symptom; AD26 may bundle a newer runtime again, so it's worth checking what Altium.SDK.dll in AD26 targets.

2. Coordinate parsing breaks under decimal-comma cultures

Altium's .NET host runs with the OS culture. On any locale where the decimal separator is a comma (most of Europe), double.Parse("3968.898") either throws or parses as 3968898 — every coordinate containing a dot is corrupted, MMsToCoord overflows, and primitives land kilometers off-origin. All EasyEDA numeric parsing now uses CultureInfo.InvariantCulture (via central EeParse helpers).

Additional fixes

• Missing layer mappings — added Document, ComponentShapeLayer, LeadShapeLayer, ComponentMarkingLayer, BottomAssembly, and the BoardOutLine spelling actually emitted by EasyEDA; fixed BottomSolderMaskLayer mapping to bottom solder mask (it mapped to paste).
• CreateText Y coordinate — it used GetState_XLocation for Y, so all text placed on a diagonal.
• Error visibility — per-primitive import exceptions were swallowed; they are now logged to Documents\AltiumEE\import-errors.log so failures like the above are diagnosable.

Build changes

• The csproj is converted to SDK style so it builds with the dotnet CLI (the old project file is kept as EasyEDA-Loader.csproj.legacy).
• Altium/DevExpress references resolve from an Assemblies\ folder (git-ignored, not committed — they're Altium's proprietary DLLs). To build, copy from your AD25 installation into EasyEDA-Loader\Assemblies\: Altium.SDK.dll, Altium.SDK.Interfaces.dll, Altium.Controls.dll, Altium.Controls.Skins.dll, and the DevExpress.*.v22.1 assemblies referenced in the csproj.

Tested on Altium Designer 25 (Windows 11, on a decimal-comma locale): symbols and footprints from LCSC/EasyEDA now import with correct geometry, layers, and text placement.

[Copilot]

Pull request overview

This PR updates the EasyEDA Loader Altium extension to work correctly under Altium Designer 25’s .NET 6 hosting environment and fixes locale-dependent numeric parsing that caused corrupted coordinates (leading to empty/garbage imports). It also improves layer mapping correctness, fixes a text-placement coordinate bug, and adds diagnostic logging for previously swallowed per-primitive exceptions.

Changes:

• Retargets the extension to net6.0-windows via an SDK-style .csproj and retains the old net48 project as a legacy file.
• Makes numeric parsing culture-invariant across symbol/footprint parsing paths to prevent decimal-comma locale breakage.
• Fixes layer mappings, corrects CreateText Y placement, and adds ImportLog + UI warning for import failures.

Reviewed changes

Copilot reviewed 20 out of 20 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
EasyEDA-Loader/SymbolShapes/EeSymbolRectangle.cs	Uses invariant culture for rectangle coordinate parsing.
EasyEDA-Loader/SymbolShapes/EeSymbolPin.cs	Uses invariant culture for pin/font-size parsing to avoid locale issues.
EasyEDA-Loader/SymbolShapes/EeSymbolEllipse.cs	Uses invariant culture for ellipse numeric parsing.
EasyEDA-Loader/SymbolShapes/EeSymbolCircle.cs	Uses invariant culture for circle numeric parsing.
EasyEDA-Loader/Shapes.cs	Central parsing helpers now use invariant culture; point list parsing fixed.
EasyEDA-Loader/ImportLog.cs	New file: persistent per-primitive error logging with error counter.
EasyEDA-Loader/FootprintShapes/EeFootprintVia.cs	Uses invariant culture for via numeric parsing.
EasyEDA-Loader/FootprintShapes/EeFootprintTrack.cs	Uses invariant culture for track stroke width parsing.
EasyEDA-Loader/FootprintShapes/EeFootprintText.cs	Uses invariant culture for footprint text numeric parsing.
EasyEDA-Loader/FootprintShapes/EeFootprintRectangle.cs	Uses invariant culture for footprint rectangle numeric parsing.
EasyEDA-Loader/FootprintShapes/EeFootprintPad.cs	Uses invariant culture for pad geometry/rotation parsing.
EasyEDA-Loader/FootprintShapes/EeFootprintHole.cs	Uses invariant culture for hole geometry parsing.
EasyEDA-Loader/FootprintShapes/EeFootprintCircle.cs	Uses invariant culture for footprint circle numeric parsing.
EasyEDA-Loader/FootprintShapes/EeFootprintArc.cs	Uses invariant culture for SVG-arc numeric parsing and stroke width parsing.
EasyEDA-Loader/FootprintShapes/EeFootprint3dModel.cs	Uses invariant culture for 3D model transform parsing.
EasyEDA-Loader/EEPCB.cs	Corrects/extends layer mappings; fixes CreateText Y coordinate placement.
EasyEDA-Loader/EasyEDALoader.cs	Resets/imports error logging, logs per-footprint failures, warns user post-import.
EasyEDA-Loader/EasyEDA-Loader.csproj.legacy	Adds preserved legacy net48 project file for reference/back-compat builds.
EasyEDA-Loader/EasyEDA-Loader.csproj	Converts to SDK-style net6.0-windows project and updates references/package usage.
EasyEDA-Loader/API/EasyedaApi.cs	Uses invariant culture for 3D transform parsing in API layer.

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