Autoclose: v0.2 - many improvements

* add removing pairing brace by Shift+BackSpace
* do not add semicolon in #define-s
* add semicolon after class and struct
* now works with GTK3+ (thanks Matthew Brush for patch http://pastebin.geany.org/r2VKS/)
* added scrollbar for settings
* improve semicolon completion
* added help
* added Tab jump to enclosed char (thanks Thomas Martitz: https://github.com/kugel-/geany-plugins/commit/7f19c3035abf6f8a7fa66c7b4c1efe0851cb2f83)