Updated ipreferences_merge to use GSettings
Updated terminal.c:terminal_set_preferences() to use GSettings. GSettings keys come from newly added header file.
Rename key to indicate use of default terminal profile.
Added schema setting to store current profile uuid.
Point "use default profile" checkbox in terminal preferences ui to renamed gsettings key.
Terminal plugin can set terminal colors. Edit terminal plugin UI to reflect selection of default profile settings.
Updated preferences UI so that profile name and uuid are displayed
Terminal palette wouldn't change because of missing pointer dereference.
Added byline