Add Set/GetAircraftHeight, Set/GetJetpackHeight

- Adds SetPlayerAircraft(Max)Height
- Adds GetPlayerAircraft(Max)Height
- Adds SetPlayerJetpack(Max)Height
- Adds GetPlayerJetpack(Max)Height
Merge pull request #14 from Whitetigerswt/master

Add Set/GetAircraftHeight, Set/GetJetpackHeight