add empty panel
Fixed build error for flash.

VerifyError error #1053 illegal override. Solution taken from FastDoubleCellForwardIterator.
Merge commit 'f21aff854bc79acb13e445b883533f55df7eb4ad' into haxe3
Build script setup for relative paths on OSX.
Setup PATH and HAXE_LIBRARY_PATH for your own environment.
Swap order of Float and Int utility class declarations.
Fixes Ints being typed as Floats when they should remain Ints.
Fix type inference errors, Ints wrongly being typed to Floats.
Also fix a viewer release build error.