Stop minigun sound when gtMinigun is destroyed

QT for some reason messes with XCompose causing broken input (Qt 5 only - Qt 4 did not break anything). In Qt 5.2 and 5.3 this was causing an invalid conversion in chat messages containing these resulting in the bad bytes being stripped. In Qt 5.9 it is still broken, but you at least get a string with something in it. This checks for non-zero converted strings for room creation and chat lines.

Fix bullet trails overlapping when the pass through wrap or bounce world edge

Use QDir::Files to read ammo schemes

Don't let hedgehogs moan if they take 0 Sudden Death damage

Fix minigun bullets hitting shooter when it hits hog on other side of world wrap

Update changelog

merge with 0.9.23, pulling in unc0rr's desync fix

cleanup whitespaces, add braces to for loops also throw in a break for good measure

I guess "Fix weapon scheme lookup being unnecesarily persisted"?.. or something

Quick Game: ignore hidden themes

Fix segfault on game halt (if no logfile)

quick game wasn't checking for hidden themes. It should, but this will at least make them not-crash. The results are kind of amusing.

Remove “mission accomplished” victory message, might be confusing For example, if this appears in an actual mission when the player fails.

Show simple drop-down icon next to key binder widget