fix issue #54
fix issue #56
fix issue #59 purple_write in other thread crash
enable html conversation
send msg style format ok
recv msg font style ok
fix a small bug
may fix issue #57
map font size
map font size
map font size
Merge pull request #64 from felixonmars/dev

Font size map
change font size map
add disable_custom_font_size option
add disable_custom_font_size option
add disable_custom_font_size option
add disable_custom_font_size option
add disable_custom_font_size option
add disable_custom_font_size option
add disable_custom_font_size option