Let the user choose Dock icon vs. menu bar vs. background-only presence

[trsdn]

Problem

OpenSwitchr always runs as a menu-bar-only accessory app (LSUIElement): no Dock icon,
ever, and no way to turn one on. Some people would rather have a Dock icon
(easier to find, shows up in Cmd-Tab and the Dock, no permanent menu bar
clutter) instead of, or in addition to, the menu bar item.

Proposal

Add a "Presence" (or similar) setting with a small number of modes, e.g.:

• Menu bar only (today's fixed behavior)
• Dock icon only — no status item; the window/Settings reachable from the
  Dock icon's menu
• Dock and menu bar — both, for people who want either path
• Background only — no persistent UI element; relaunching the app while
  it's running brings up its window

Needs NSApplication.setActivationPolicy(...) switched at runtime
(.regular / .accessory) plus a reopen handler for the "background only"
case, and the choice needs to survive relaunch (stored the way other startup
settings already are).

Constraints to check before implementing

• Anything that assumes there is no Dock icon / no .regular activation
  (window activation, Cmd-Tab visibility assumptions, single-instance
  handling) needs review, not just a policy flip.
• Losing the menu bar icon must not lose the only way to reach the app's
  functionality.

Related

Same request filed across the menu-bar apps in this account:
trsdn/OpenPromptr trsdn/OpenFreshr trsdn/PtionsPlus trsdn/OpenWritr trsdn/OpenZombr trsdn/OpenZonr

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