GUI improvements

 - Trim widget sizes
 - Set anchor directions

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Remove example skins & measures

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Add icon resource

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Change window title to "Rainmeter Builder"

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Limit meter creation to ImageMeters only (for now)

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Disable MeterDisplay widget on startup

 - It should only be enabled when a meter is selected

Signed-off-by: James Tasker <james_tasker1@hotmail.com>