Release 0.5.3

Changes in v0.5.3

Feature changes

• (main_win): ask user if unsaved changes should be save upon closing
• (main): use human_panic for better panic output

Bugfixes

• (main_win): prefix params with an underscore in plugin_started
• (build): set plugin_dir to '/usr/local/lib/gxi/plugins' by default
• (main_win): set title for ask_save_dialog
• (edit_view): fix line numbers upon scrolling