First draft of the conversion of clipper.cs to .hx (annotated with TODOs)
Fixed simple errors (now on to more serious stuff)
Removed break from switches
Other round of fixes:
 - swap
 - xor
 - mulitple function declarations
 - finally
 - .clear()
Successfully compiles (but doesn't work yet!)
IntPoint.equals()
Fixed remaining refs (no more infinite loops but not quite there yet!)...
and found out _only now_ the main C# difference of struct vs class (i.e. value vs ref)