fix DRONE-15

deactivate Drone with Feature flag
improve Gradle build Feature output
add LegoNXT build flag
fix typos
Merge pull request #989 from Catrobat/DRONE-15_drone_buildflag

DRONE-15 - buildflag
Refactor TermsOfUseFragment CAT-1042
Change "Terms of Use" dialog text to Terms of use: little changes
little changeIII
strings.xml modified
changed class names and method names
update

Conflicts:
	catroid/src/org/catrobat/catroid/ui/dialogs/TermsOfUseDialogFragment.java