-> Fix server crash with protocol >=25 if a default password is set.
-> Remove some useless and possibly confusion causing code for the TOCLIENT_FIRST_SRP packet handler

-> Fix bug where MoveSomewhere from an infinite source would fill the destination inventory with copies of itself.
-> Fix bug where MoveSomewhere would needlessly call callbacks.
-> Remove trailing whitespaces

Mgv5/mgv7: Remove 'should make cave hole' feature
Remove ravine code

Replaces while loops with proper getfield calls

The Irrlicht engine supports antialiasing, and Minetest already supports
saving an antialiasing setting in its configuration file.  However,
Minetest lacked UI elements to set this setting, and previously the only
way to enable the feature was by hand-editing the configuration file.

Add a drop-down menu that can enable antialiasing.

The doc and the actual behaviour differed.

Change the name for texture pack description files from "info.txt" to "description.txt" in order to keep the naming consistent between description files for both mods and texture packs.

Also add backwards compatibility for texture packs that use "info.txt", and note in the log that "info.txt" is depreciated.

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Also don't show "probably running a different version" message in simple singleplayer mode

Improve TOCLIENT_ACTIVE_OBJECT_MESSAGES robustness for handling invalid data

Add serializeHexString()
Clean up util/serialize.cpp

Fix 'is ground content' for some nodes

- Stop attempting to start a world when no world's created/selected in server tab
- Better world's indexes handling between subgames lists