Compatibility checker should list DLC in the TMPE.log

[originalfoo]

Some of our features are DLC dependent; missing DLC could potentially break them (might go unnoticed for long time if most users have the DLC).

TMPE.log should list state of relevant DLCs.

Things like content creator packs and music DLCs should not be listed (they have zero effect on TM:PE).

[originalfoo]

Done, pending merge of linked PR.

[krzychu124]

Which TM:PE feature is DLC dependent? Just curious.

[originalfoo]

• Road condition has impact on driving speed = Snowfall
  • This is the only one I'm aware of that Victor ever mentioned being actually dependent on DLC (he made note of it in the docs).
• Evacuation bus policies = Natural Disasters.
• Bike ban on sidewalks (affects pathfinder) = After Dark
• Old town (affects pathfinder; notably see Old Town policy shouldn't affect public transport #371) = After Dark
• Combustion engine ban (affects pathfinder) = Green Cities

There are also policies which affect transport preferences (I assume those get handled in the AIs?) such as Encourage Biking (After Dark), Come one, Come All (Match Day), High Ticket Prices / Prefer Ferries (Mass Transit), etc.

There's some that affect services, such as Helicopter Priority (Natural Disasters), and so on...

So I thought it would be useful to include which of the transit-affecting DLCs the user has in the TMPE.log in case it will be useful tracking down bugs in future.