Updated groupMarker component
* moved to f/groupMarkers
* updated code to be more straightforward/readable (removed unnecessary clauses etc.)
* group- and specialistMarkers are now side-sensitive (change shape accordingly)
* changed existing groupMarkers types: 7: mech_infantry (for IFVs), 8: tanks (was 7), 9: helo (was 8)
* added new groupMarker types: 10: planes, 11: artillery
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* typo fixes
Merge branch 'dev' of https://github.com/ferstaberinde/F3 into dev-groupMarkerRestructure

* fixed conflict in description.ext
Merge pull request #256 from Wolfenswan/dev-groupMarkerRestructure

groupmarker component restructure