NB: Minor edits to patch made by Zeno- (int to short and minor formatting)

Also fix leaking globals found by it.

This adds proper support for nested tables and improves performance a bit.

Signed-off-by: Craig Robbins <kde.psych@gmail.com>

Signed-off-by: Craig Robbins <kde.psych@gmail.com>

Errors found by @Sokomine.

Signed-off-by: Craig Robbins <kde.psych@gmail.com>

Thanks @oleastre

Signed-off-by: Craig Robbins <kde.psych@gmail.com>

Signed-off-by: Craig Robbins <kde.psych@gmail.com>

Mapgen v5: Fix minor style issue

Add BiomeManager, OreManager, DecorationManager, and SchematicManager

Create faster key cache for main game loop (client)

- Don't create and cache an extruded mesh for every (non-node) item.
  Instead use a single one per image resolution.

- For cubic nodes reuse a single wield mesh too

- Improve lighting of the wielded item

- Increase far value of wield mesh scene camera, fixes #1770

- Also includes some minor refactorings of Camera and GenericCAO.

See: https://github.com/minetest/minetest/issues/1790

a) Fix double tap for jump and show_debug
b) Revert changes to limitFps()... there is no verification that the new method was an issue, but going back to old method just in case
b.2) limitFps() no longer calls device->run() and also no longer has to be called immediately after a call to device->run()

Also shortens some related code and adds more parameters to string.split.

Fix time of day persistence
Fix wield item being updated every frame causing small performance hit
Rename some classes and variables

Updated: Incorporated feedback from 'kahrl'
Updated: Moved MinetestApp::boolToCStr() from game.cpp into string.h renaming it bool_to_cstr()