First step toward using libappindicator.
Minor refactoring.
* ctypes-utils: just log 'Info' if lib not found.
* Cleaning
Further AppIndicator implementation:
* Refactoring: split StatusIcon into GtkStatusIcon and AppIndicator.
* Add AppIndicator-specific menu items (tooltip + ShowHide)
* Show/hide on scroll.
* Setting icon visibility.

Due to appindicator's limitations, we'll need to abandon these:
* Icon text (message count).
* Themed icons (multiple icon names).
* AppIndicator: disable chat icon (TB).
* AppIndicator: disable new message count option (TB).
Add 'middle_click' option.

Mainly intended for AppIndicator. Not used in winnt yet.
Merge branch 'appind'
Fix uk-UA locale (thx daveschaefer/checkloc).
Notes.
Handle option renames properly.