v1.29.1 draft

[GeckoEidechse]

Changes:
Run compile check on vanilla as well (Mods#911)

Code refactoring:
mods: Move mod content related logic to dedicated package (Launcher#829)
mods: Move collecting mods to own function (Launcher#830)
Use env var to define DiscordRPC version (#727)
Rework MAD cleanup handles (Launcher#817)

Fixes:
Fix Thunderbolt crashing clients when owner is invalid (Mods#906)
Fix transferring active Stim ability to Titan and endless stim effects (Mods#864)

Contributors:
@Alystrasz @ASpoonPlaysGames @Gazyi @GeckoEidechse @Zanieon