Backpacks now uses a similar system as personal radios (pull request for...

... it https://github.com/michail-nikolaev/task-force-arma-3-radio/pull/371) in having a default radio per a side that is settable and taken into account with ProcessRespawn.

Moved vehicles over to using the default radio for side. (https://github.com/michail-nikolaev/task-force-arma-3-radio/issues/367)
Moved IsolatedAmount to config for vehicles. (https://github.com/michail-nikolaev/task-force-arma-3-radio/issues/362)

Implemented getConfigProperty in accordance with (https://github.com/michail-nikolaev/task-force-arma-3-radio/issues/362#issuecomment-34114437)