Several new sirens added and demonstrator vehicles updated.

- Whelen Epsilon
- Federal Signal PathFinder SmartSiren and Unitrol
- SoundOff Signal single and dual variants
- Code 3 Z3
- Motorola Astro Spectra
- D&R IQ Elite (modern Intimidator sounds)

(New siren tones were made exclusively for Photon 2 using both manufacturer samples and sound synthesis.)

- MPDC (SoundOff dual tones and improved lighting patterns)

The Whelen Ion surface-mount components require Anemolis72's Component and Props Pack. This has been added to the starter package collection and can be directly subscribed to here: https://steamcommunity.com/sharedfiles/filedetails/?id=2932505261

- Added proper vehicle lighting to the 2021 Durango
- Added support for daytime running lights (DRLs), utilized by the Durango and 2016 FPIU
- Overhauled CSP demonstrator vehicle to realistic equipment and flash patterns
- More resiliency enhancements to vehicle library (no longer breaks on component error)
- New component support: Whelen Inner Edge, Whelen Ion (surface options), Whelen Dominator

Photon v2.0.19
- New animated and functional PAR46 spotlights
- New Federal Signal MB1 message board and controller components
- Enhanced functionality of Boulder PD FPIU and Fort Collins PD CVPI
- New Photon 2 logging system (logs kept in data/photon_v2/cl_log.txt (& sv_log.txt)
- Improved library system with better reliability
- Missing vehicles are easier to troubleshoot
- Various bug fixes

- Updated Boulder PD demonstrator to use near complete functionality
- Fixed NULL entity error when leaving a controller's PVS
- Forced cursor visibility when opening Photon Menu window to keep it from becoming unclosable
- Fixed issue where vehicle passengers could operate the lights/sirens (GAuto and VCMod)

...and a fix for the siren tone error

Fix for initialization potentially breaking (attempt to index field 'Index' error)

Fixed issue with input configuration (controls) not applying when saving. Fixed issue with certain siren configurations not loading correctly. Fixed issue with incorrect siren override sound being used (input priority problem).

Mitigate potential issue where equipment isn't loaded or reloaded correctly in the Photon demo vehicles.

Developer enhancements, updates to Boulder PD components (still a WIP), use GIF icon

Fix level-of-detail distorting the HUD, add input configuration load retry in case of abnormal load order