PC-12 NGX Throttle Beta Range Implementation

This add-on addresses the lack of a beta range in the PC-12 NGX for Microsoft Flight Simulator 2024, which causes issues with ground handling and excessive forward momentum even at idle throttle. The mod allows users to engage the beta range by moving the throttle below idle, enabling controlled taxiing speeds without abruptly entering reverse thrust. While it offers a more realistic ground handling experience, some limitations related to RPM and thrust values remain.