2 small fixes.
Adds PlaySound effect and executor.
Removed icon String from the prefab panels.
Some improvements to the SoundSystem, SoundComponent and GameStructure to accept sounds.
Adds SoundPanel and necessary actions.
Minor changes in some commands.
Added active zones functionallity.
Merge pull request #741 from gorco/InteractiveZones

Added active zones functionallity.
Merge pull request #742 from RotaruDan/soundFunctionality

Sound functionality
w.i.p
W.I.P.-2
WIP3