Basic search functionality on text items.
 - Hacked in UI elements, final UI depends on GTK3 progress
 - Can select text then hit Ctrl+F to search
 - F3 triggers "Find Next"
Basic UI loads with icons using GtkBuilder
Removed generated code, no more Gtk Critical errors
Refactoring and comments; made search loop over all pages
Connect signals using GtkBuilder
Remove generated file from source control
Fix NULL pointer obj getters
Fix broken/missing shortcuts
Fix menu radio buttons

Radio buttons are activated programatically at runtime based on saved
settings rather than in Glade
Use the latest GtkBuilder Glade XML file, save the old one for
reference
Add xournal.glade to the Makefile

It is now copied to the appropriate install location with the pixmaps.
On Xournal startup, it searches CWD for xournal.glade, then the install
location.
Add G_MODULE_EXPORT macro to callback functions for Windows support
Make linking of 'gmodule-export-2.0' platform specific

Windows does not require this module, instead, it uses the
G_MODULE_EXPORT macro.
Merge branch 'gtk-builder' into search

Conflicts:
	src/xo-callbacks.c
	src/xo-callbacks.h
	src/xo-interface.c
Finishing merge with gtk-builder; re-added UI elements and hooked up callbacks
Added backwards searching
Fixed bug where search wouldn't wrap all the way around; refactoring and clean up
Remove unused, deprecated glade project file.
Merge branch 'gtk-builder' into search
Scrolling to items seems to work