- Disable pkgconfig(webkit-1.0), as we do not want to use this as
it is unsupported by upstream.

- Geany was switched to build against gtk3, so also switch
this -plugins package to gtk3 too:
+ Disable the following plugins because they do not build
against gtk3: Debugger, DevHelp, GeanyDoc, GeanyGenDoc,
GeanyLaTeX, GeanyMacro, GeanyNumberedBookmarks, GeanyPrj,
Geanypy, Markdown, MultiTerm, Scope, WebHelper.
+ Update BuildRequires:
- Update geany version to 1.26.
- Replace pkgconfig(gtk+-2.0) by pkgconfig(gtk+-3.0).
- Replace pkgconfig(gtkspell-2.0) by pkgconfig(gtkspell3-3.0).
- Remove gconf2-devel, no longer required after the switch to
gtk3.

- Update to version 1.26:
+ General: Add a note about deprecating Waf build system --
will be removed with 1.27.
+ Addons:
- Add new feature to copy path of current file into clipboard
(#291).
- Update bookmark list also on any line changes in the
document (SF#129, SF#39, #284).
- Add GTK3 support (#271).
+ GeanyPy: Fix Python library loading on Debian based systems.
+ GeanyVC:
- Add GTK3 support (#300).
- Little improvements on commit dialog (#300).
+ GitChangeBar: Add support for libgit2 0.23 (#283).