Prep for release

[haxiomic]

• [x] convert to C after typing
• [x] fix Main_Main_name() problem
• [x] stop could have the option to wait for scheduled events
  • waitUntilEventLoop empty is nice but new events can be scheduled afterwards before a stop call
  • stopHaxeThreadAfterPendingEvents() ?
  • stopHaxeThreadIfRunning(bool waitOnScheduledEvents)?
• [x] stop should be clear it can be called many times safely: stopHaxeThreadIfRunning()?
• [x] test options for returning a haxe object, maybe Pointer is the right approach here because it may increment the reference count
• [x] check for content change before saving implementation cpp since this will be faster
• [ ] allow haxe thread to start again
  • unresolved issues with the hxcpp GC – seems to hang (see test branch)
• [x] HaxeObject wrapper to enable returning any object to C while retaining a GC reference (also add new C function releaseHaxeObject())
• [x] consider renaming to C.hx or HaxeC.hx
• [x] add metadata like @c.name
• [ ] docs
  • [x] update C function docs
  • [x] header comment
  • [ ] what types can be used with C
    • GC safe haxe object passing example
  • [x] worked example from scratch
  • [ ] minimal OpenGL example
• [x] license