Fixed some bugs.

Fixed Thumb Shift mode. timeout_and_full is no longer available in pygobject3.
Fixed __cmd_circle_dict_method
Used setxkbmap in Thumb Shift mode. until Gdk.property_get is fixed.
Removed Hiragana_Katanaka in circle_kana_mode for latin_with_shift
Added customizable Hiragana_Katakana key.
Released 1.5.2

Fixed some bugs.
Added customizable Hiragana_Katakana key.