Automatic merge of T1.5.1-1603-gb8c8c9a48 and 12 pull requests

- Pull request #900 at b54024b: DMI in 3D cab + two more dials
- Pull request #892 at 1f5ba4c: Signal Function OPP_SIG_ID_TRAINPATH
- Pull request #961 at ffccb2e: Improvements for Power Supplies
- Pull request #1015 at 14c132b: Enhancements for EP brakes
- Pull request #1026 at 6a89a97: Fix for Multiplayer: remote trains chuff can't be heard https://bugs.launchpad.net/or/+bug/2092771
- Pull request #1029 at 31fd7d2: Superelevation Follow Up Fixes
- Pull request #1031 at 34aa23a: Multiplayer Server, forked from Open Rails Ultimate; blueprint https://blueprints.launchpad.net/or/+spec/multiplayer-server
- Pull request #1047 at eb8027b: Docs: adds translation docs
- Pull request #1051 at 0ac5d30: Mouse wheel support for cabview controls + refactor
- Pull request #1058 at 626ebed: Refactor notification parameters
- Pull request #1055 at d1a56b3: Route Based TTrack Sounds
- Pull request #896 at f1681df: First implementation of https://blueprints.launchpad.net/or/+spec/specific-sounds-for-ai-trains

Author: openrails-bot