theme: Remove unused RECTANGLE code

https://bugzilla.gnome.org/show_bug.cgi?id=662962
theme: Consolidate unused ops

https://bugzilla.gnome.org/show_bug.cgi?id=662962
theme: Properly indent code

s/tabs/spaces/

https://bugzilla.gnome.org/show_bug.cgi?id=662962
theme: Remove dead code

While the comment claims that we may want to keep this around
for optimization purposes, the operations are raw bitmap operations
that would be cleaner done in cairo.

https://bugzilla.gnome.org/show_bug.cgi?id=662962
theme: Replace char array element comparisons with strncmp

https://bugzilla.gnome.org/show_bug.cgi?id=662962