emulator has keyboard now
free blitbuffer as soon as tile is kicked out from cache
other than waiting for the lazy garbage collector of lua
add DSHOWHIDDENFILES in defaults.lua
this should fix #239
update page info layout in menu
this should fix #281
fix toggle color inconsistency
change medium and large defect sizes to 3.0 and 5.0 respectively
add DEBUGBT function to traceback certain location
fix extra page rendering when starts up in landscape mode
remove chi_tra lang code in defaults.lua
add width param in ToggleSwitch
Merge pull request #303 from chrox/master

free blitbuffer as soon as tile is kicked out from cache