In some cases template tags can also contain some other symbols like colon.
In some cases template tags can also contain some other symbols like colon.

There are persistences which allow field names like "cmis:objectType". Grid picks up this field name and creates template tag {$cmis:objecttype}, but Template class don't recognize this as tag because of colon. This commit fixes that.

atk4/ui,atk4/ui,atk4/ui