MechJeb 2.15.1 compatibility fixes

[adventure-gpt]

relates to issue: #169

• Update JSIMechJeb.cs field bindings to use PascalCase for MJ 2.15.1:

  • MechJebCore: target->Target, node->Node, attitude->Attitude, vesselState->VesselState
  • AbsoluteVector: latitude->Latitude, longitude->Longitude
  • ComputerModule: enabled->Enabled, users->Users
  • EditableDouble/EditableDoubleMult: val->Val property
  • ReentrySimulation.Result: outcome->Outcome, endPosition->EndPosition, endUT->EndUT

• Add MechJebModuleAscentSettings support (replaces AscentAutopilot/AscentGuidance):

  • DesiredOrbitAltitude, DesiredInclination fields
  • AscentAutopilot property access for autopilot control

• Fix FuelFlowSimulation type lookup:

  • Try MechJebLib assembly first (MJ 2.15.1 moved it there)
  • Fall back to nested type in MechJeb2 assembly

• Fix stage stats handling for List:

  • Use Count property and get_Item method instead of array access

• Fix ButtonAscentGuidance/ButtonAscentGuidanceState:

  • Try MechJebModuleAscentBaseAutopilot first
  • Fall back to AscentSettings.AscentAutopilot property
  • Use MechJebModuleAscentMenu instead of AscentGuidance
  • Handle Users property with PascalCase fallback

• Fix MechJebRPM.cs:

  • Update module check from MechJebModuleAscentAutopilot to MechJebModuleAscentSettings
  • Fix Force Roll menu index (5->6) for Home button adjustment