Log Message:
Update onscripter to 20130120.

Upstream changes summary (only Japanese log available)

20130120
 - fix a timer bug introduced in 20130112 that cause too fast animation

20130119
 - fix bugs in definereset and reset insns

20130118
 - fix bug that can't get right hight of character sprite

20130112
 - fix event loop handlers to make NSLua work correctly
 - fix a bug around text new line
 - improve yesnobox and okcancelbox button drawing
 - add Lua support to Android SDK