make GSettingsSpinButton aware of ranges defined in the schema
add a range for panel heights with a minimum of 20px
[Workspace OSD] Limit min/max right/bottom position.
Merge pull request #4 from autarkper/cobidev-gsettings-range

[Workspace OSD] Limit maximum right/bottom position.
adjusting range for workspace-osd-x to the range of workspace-osd-y, in agreement with @autarkper
Merge pull request #1173 from Cobinja/cobidev-gsettings-range

make GSettingsSpinButton aware of ranges defined in the schema