Add chanview files to project
Add preference to change tabs on scroll

Also revert e52905f50c7ff5d123a58ba016dcbb9de2b13f4f
Fix scroll buttons when using tabs
Work around for /away being called multiple times

This will have to be solved eventually in menu.c so you can change their
status without emitting the signals.
Round 3 of Gtk accessor functions: xtext
Revert 2d5cb3ec7bc62e5c4e7b550ecade22bb53efd9f6

Scrolling has issues i couldn't easily fix, will get back to
later but lets keep this usable
Improve Windows installer

- Unify x86 and x64 installer files
- Get rid of version program
- Clean up .iss file
- Only allow one installation