Log Message:
Update onscripter to 20130812.

pkgsrc changes:
 - add patch-LUAHandler.cpp to adapt to lua 5.2 API changes

Upstream Changes (only Japanese log available)

20130812:
 - make savescreenshot and savescreenshot2 insns allow any filenames,
   i.e. allow filenames without .bmp extension as the original
   ONScripter does.