fix compile warning under GCC
widget: edit: support GB18030
Add touch and make low coupling between touch and calibration
Merge branch 'master' of https://github.com/RT-Thread/RTGUI
Fix compiling error for calibration app
widget: edit: fic compiler warnings
widget: textbox: always terminate the string on input
Merge branch 'master' of https://github.com/nongxiaoming/RTGUI