v1.29.0 draft

[GeckoEidechse]

Features:
Refactor getting mod information (Launcher#826, Mods#899)
Make MAD process cancellable (Launcher#815, Mods#865)
Add button to allow players to change teams (Mods#872)
Optional icons for server-side RUI announcements (Mods#883)

Changes:
Send all mods to Atlas that are enabled (Launcher#536)

Fixes:
Safe I/O: Only allow creating files with whitelisted filetypes (Launcher#682)
Arc Cannon charge effect fixes (Mods#862)

Translations:
Translations update from Weblate (Mods#902)
Translations update from Weblate (Mods#904)
Translations update from Weblate (Mods#905)

Contributors:
@Alystrasz @ASpoonPlaysGames @Gazyi @GeckoEidechse @harmony-weblate @NachosChipeados @Zanieon