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

Spare some copies.

Use wide_to_utf8 and utf8_to_wide instead of wide_to_narrow and narrow_to_wide at almost all places.
Only exceptions: test functions for narrow conversion, and chat, which is done in a separate commit.

- Fixed race conditions
- Fixed null dereference
- Fixed out-of-bounds array access
- MinimapMapblock is now allocated and added to update queue only when enabled
- Removed dependency on LocalPlayer
- Fixed code style
- Simplified expressions and program logic
- Cleaned minimap object interfaces

Also, clean up surrounding code style
Replace by-value parameter passing with const refs when possible
Fix post-increment of iterators

Before this commit autofast for Android was ignored if the user was sneaking, digging or building. There is no reason for this and it impedes movement control

In worlds with many mods we can easily reach timeout, waiting for the server to start.

Move texture_min_size even further down the pipe. Now, textures are JIT-upscaled using an image transformation, right at the time they're added to a mesh or particle; images used in 2D elements are left unscaled. This should fix any remaining issues with HUD elements.

Invert the meaning of holding down the fast button (i.e. holding down the fast button -- if there is one -- means walk), unless performing an action, sneaking or jumping.
Still requires fast move to be toggled on (and fast priv)

This removes a lot of narrow/wide conversions where a wide string was never used.

  * Combine client and server man pages.
  * Update unit test options and available databases in man page.
  * Add `--worldname` to man page.
  * Fix a bunch of places where `"Minetest"` was used directly instead of `PROJECT_NAME`.
  * Disable server build by default on all operating systems.
  * Make `ENABLE_FREETYPE` not fail if FreeType isn't found.
  * Enable LevelDB, Redis, and FreeType detection by default.
  * Remove the `VERSION_PATCH_ORIG` hack.
  * Add option to search for and use system JSONCPP.
  * Remove broken LuaJIT version detection.
  * Rename `DISABLE_LUAJIT` to `ENABLE_LUAJIT`.
  * Rename `minetest_*` variables in `version.{h,cpp}` to `g_*`.
  * Clean up style of CMake files.

* Sort includes
* Remove unnecessary includes
* Ensure the parameter name for GameRunData is consistent for class member functions

The bar is only drawn when the user will notice a change, which prevents time overheads that this commit would cause, resulting from useless draws.

For usages of assert() that are meant to persist in Release builds (when NDEBUG is defined), replace those usages with persistent alternatives

(PR Modified slightly)

Don't permit to open inventory is playerCAO isn't present. This prevent to open an empty inventory at player load. ok @zeno-

Disables local map saving for all local server types

See: https://github.com/minetest/minetest/issues/2024

Settings fixes Make the GameGlobalShaderConstantSetter use the settings callback (8% perf improvement in game loop) Ensure variable is set Ensure settings callback is threadsafe

Revert "Make the GameGlobalShaderConstantSetter use the settings callback (8% perf improvement in game loop)"

This reverts commit a555e2d9.