Also fix a memory leak
Fix overloaded virtual warning in Player::move()
Remove some trailing whitespace

 - General code cleanup
 - Unified object creation and loading
 - Specifying objects in APIs is now orthogonal (i.e. anything can take an ID,
   name string, or the raw table definition (and automatically registers if present

#2583

Because we get a Buffer<u8> from ConnectionEvent, don't convert it to SharedBuffer<u8> and return it to Server/Client::Receive which will convert it to NetworkPacket
Instead, put the Buffer<u8> directly to NetworkPacket and return it to packet processing
This remove a long existing memory copy
Also check the packet size directly into Connection::Receive instead of packet processing

remove command from queue on success, else do nothing, instead of remove command from queue and push it front on success

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.

Filename screenshot_ + ISO 8601 format + [-serial]

i.e. screenshot_YYYY-MM-DDTHH::MM::SS[-serial].png

Serial is added if the filename + timestamp already exists and is in the range 1 to 999

Add core.clear_registered_schematics() and refactor schematics somewhat

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 fixes main menu not fitting for 800x600 (and lower resolutions) on PC builds

E.g. Sound and freetype always being disabled, redefinition of pre-processor directives

Thanks @SmallJoker for noticing the issue

Update minetest.po

Update minetest.po

Also updates and uses porting::getSupportedVideoModes()

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.

Don't send an InventoryAction at each setInventoryModified, we only need one SendInventory per inventory modification

Client doesn't like to receive multiples SendInventory for one action, this can trigger glitches on clients (sometimes due to incorrect UDP packet ordering due to UDP protocol)

This fix issue #2544

Increases the key/buttons repeat delay for fly, noclip, fast, debug and camera buttons