* Rename everything.
    * Strip J prefix.
    * Change UpperCamelCase functions to lowerCamelCase.
  * Remove global (!) semaphore count mutex on OSX.
  * Remove semaphore count getter (unused, unsafe, depended on internal
    API functions on Windows, and used a hack on OSX).
  * Add `Atomic<type>`.
  * Make `Thread` handle thread names.
  * Add support for C++11 multi-threading.
  * Combine pthread and win32 sources.
  * Remove `ThreadStarted` (unused, unneeded).
  * Move some includes from the headers to the sources.
  * Move all of `Event` into its header (allows inlining with no new includes).
  * Make `Event` use `Semaphore` (except on Windows).
  * Move some porting functions into `Thread`.
  * Integrate logging with `Thread`.
  * Add threading test.

Due to compatibility concerns, this is temporarily disabled.

Move debug streams to log.cpp|h

Move GUI-related globals to clientlauncher

Move g_settings and g_settings_path to settings.cpp|h

Move g_menuclouds to clouds.cpp|h

Move g_profiler to profiler.cpp|h

This was a regression introduced by f6e4c5d9 .

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

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.

Make the GameGlobalShaderConstantSetter use the settings callback (8% perf improvement in game loop)
Amend the settings callback to support userdata

This greatly reduces the complexity of Settings code.
Additionally, several memory leaks were fixed.

Add 'absolute value' option to noise map functions
Extend persistence modulation to 3D noise
Extend 'eased' option to noise2d_perlin* functions
Some noise.cpp formatting fixups

 - Remove blank setting values when setting has a group
 - Pair setting values with groups in file when possible
 - Preserve user-set whitespace in setting objects
 - Delete setting value when setting NoiseParams group
 - Delete overwritten groups outside of lock

Add format example to minetest.conf.example
Add Settings::setU16()
Throw exception on attempted access of NULL settings groups

Note: this does not fix the warnings generated by clang

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

Broken by 6bc4cad0, e.g.
  minetest --worldname world
would be parsed as
  minetest --worldname --worldname

This also cleans up settings a bit