Begin using gschema

[Timecraft]

Using gschema.xml, which is already present will allow for us to save state.

We should be able to:

• Have a window position; we should be able to put the window where the user last had it.
• Have a window size; we should be able to make the window as big as it was previously.
• Have a pane size; we should be able to make each side of the app (sourceview and webview) the size they were last time the user had the app open.

[Timecraft]

Some gschema stuff has been added. JS Test now can attempt to access io.elementary.code.settings schema, org.gnome.gedit.preferences.editor schema, or just go to the default values.