Add command help for /save, /delete, /saveroom and /loadroom

Add 2nd optional parameter to HedgewarsScriptLoad. If false, its OK if file does not exist. Also, return true/false on success

Backed out changeset a62408ee8281. Allowing HedgewarsScriptLoad to not stop if script is missing is dumb

Allow script to be missing when calling HedgewarsScriptLoad, return true/false based on success

Don't load locale Lua script if LOCALE == "en"

Add description of hwengine command-line arguments in --help

Critical error if loading a script has failed

Force-disable gfPerHogAmmo and gfSharedAmmo for RW and BRW

BRW: Add utilities and air weapons properly

Fix BRW adding ammoInCrate times ammo on start of turn instead of 1

Fix BRW breaking when weapon scheme assigns 2 bullet for all ammos

BRW now allows weapon scheme customization See script comments to see how.

Change button image for Tag Team

Add missing server dependencies to Travis metadata

Write down system requirements