v1.27.7 draft

[GeckoEidechse]

Features:
Play effect on flag match over (Mods#860)

Fixes:
Avoid duplication of challenge award (Mods#858)
Add IsValidPlayer() before flag return cleanup (Mods#859)
Update build instructions and CI for build subfolder (Launcher#808)
Prevent rare crash when player disconnects during War Games intro (Mods#856)
Exclude markdown files from Mods in releases (#700)

Refactoring:
engine: Remove uses of Autohook from host.cpp (Launcher#802)
Complete overhaul for the CTF script (Mods#830)

Contributors:
@ASpoonPlaysGames @F1F7Y @GeckoEidechse @LightBlueCube @Zanieon