Improved Siren Mod 3.4

Fix for BeamNG v0.31

- Fixed an issue with traffic and 0.26 update

Thanks to AmtrakSurflinerF59-PHI for the update!
Added Code 3 Z3 siren

- Fixed for 0.24
- Slightly improved behavior of the selector app when it's small

- Remade SS2000SM thanks to bona
- Added a second rumbler for PA300 thanks to bona
- Fixed a lua fatal error in cases where vehicles config were edited

- Huge thanks to aesthetical 2 for the sirens!
- Remade 80K siren
- Remade Motorola Spectra siren
- Remade Omega siren
- Remade Touchmaster siren
- Added SP Mark 7 siren
- Tweaked volume of sirens

- Fixed for BeamNG 0.23
- Tweaked volume of every siren so that it doesn't hear rape anymore

Added RDS17S siren

Fixed a bug that could cause a vehicle error on load

This is the 2nd part of the traffic update!
- Traffic now use the sirens of the mod instead of using default game's sirens.
- They randomly switch between the main siren and the rumblers (if there is any rumbler)
- They more often use the siren than the rumbler