Add Action Groups Extended from Kerbal Stuff

This is an automated commit on behalf of Diazo
Add Landing Height from Kerbal Stuff

This is an automated commit on behalf of Diazo
Merge remote-tracking branch 'ks/add-LandingHeight'
Add LandingHeight
Merge remote-tracking branch 'ks/add-ActionGroupsExtended'
Adding ActionGroupsExtended
Deleted old file
Merge pull request #378 from AlexanderDzhoganov/master

Add KerbalStuff mods