merged latest lwf (WebGL: Enable additional color with useVertexColor).
merged latest swf2lwf.rb (LWF in embedded script now refers to global.LWF instead of global.LWF.LWF).
updated lib/SERIAL because swf2lwf.rb is updated.
modified swf2res.rb to copy generated *.lua to LWFS_work_output.
added AUTO_CENTERING and support to toggle centering with 'O' key interactively.
merged latest lwf (HTML5: Fix font color).