add different save ows name strategies

became a little more complex then I hoped, please review and test

one bug fixed:
https://github.com/geopython/MetaSearch/blob/master/plugin/MetaSearch/dialogs/maindialog.py#L652
saving a Setting with a key part like 'OGC:WMS/OGC:WMTS' silently failed. 
So I changed it to a simpler: "wms from MetaSearch"

Pressing the enter button now closed the dialog with me (as I had earlier myself with another plugin). Fixed with line 105