Add last_login field to auth.txt

Also shortens some related code and adds more parameters to string.split.
Fix dump() indentation with non-tab indents
Speed up removing a node (less block mesh updates).
Add mgv5. New noise code, uses biome API. Eased 3d noise for terrain, caves, blobs
Fix regressions and minor improvements in refactor_the_game
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()
Stop inserting empty lines at end of minetest.conf file each time it is rewritten

See: https://github.com/minetest/minetest/issues/1790
Implement WieldMeshSceneNode which improves wield mesh rendering

- 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.
Add tooltips to main menu subgames button bar
Tune cave noise scales to 6. Fix blobs spflag, now enabled. Update conf.example
Create faster key cache for main game loop (client)
Merge pull request #1825 from Zeno-/control_key_cache

Create faster key cache for main game loop (client)
Serverlist: announce mg_name from map_meta.txt instead of minetest.conf
Fix profiler values not being updated (F6) and not being logged
Wielded fixes. Add shaders support.
Add Generator Element Management framework

Add BiomeManager, OreManager, DecorationManager, and SchematicManager
Add eased 3d point-value noise functions
Mapgen v7: Fix uninitialized spflags
Mapgen v5: Fix minor style issue
Fix compilation under some Linux distributions
Add option 'eased' to NoiseParams

Signed-off-by: Craig Robbins <kde.psych@gmail.com>
Improved VoxelArea variable locality, thus performance

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