[Epic] Make Engine Castor production-ready

Sub Tasks

• [Epic] Initial Requirements Testing of Engine C... (#7 - closed)
• Add versioning for software releases (#3)
• Add Code Comments / Documentation (#4)
• [Epic] Test Suite for Engine Castor (#5)
• Add basics for common coding style guides (#6)
• Multi channel line-in (#8)
• Not all media sources are stopped in time (#9)
• Livestream is not picked up after connectivity ... (#10)
• Scheduling server side M3U breaks playout (#11)
• Random fallback order is always the same (#12)
• Fallback Tracks posted to Playlog without prope... (#13)
• Heartbeat Monitoring (#14)
• Update Castor API to changes in Steering, Tank,... (#16)
• In case of re-broadcasts/repetitions, play the ... (#17)
• Prepare Admin Docs structure to include Castor ... (aura#450 - closed)
• castor requirements jack (aura#451 - closed)
• Add additional Docker Compose for new Playout P... (aura#429 - closed)
• TBD ... not all tests completed yet