Fixed issue #29 Editor doesn't support CJK

Editor now support CJK display

- Add Build option (scons cjk=yes) to bundle DroidSansFallback (34328 unicode chars) as default font to support CJK display;  
- Add loading compressed editor font support, reduce debug build size form 28M to 15M
- Add loading multi-page editor font support  (1x 4096-> 6x1024)

Nextstep:
- More control of CJK build size
- Dynamic font support (Runtime TTF)
- Multi-language editor
- IME support on Mac/Linux