Icons for OC

- new icons for opencaching
- changed some icons because of copyright
- english strings for opencaching attributes
- german strings for opencaching attributes
- new script to show (missing) strings for attributes
- new script to edit svg files from thenounproject.com
- new script to generate enums
- ocicons.html: list of all OC icons
merge conflict
Maintenance Icon Color changed to alert-red
Unit-Tests ++
- and Maintenance Icon Color changed to alert-red
Merge branch 'master' into oc_icons
- changed icons
- repaired test class
merge conflicts
Merge pull request #2465 from koem/oc_icons

Icons for OC