Add support for Solaris and HP-UX
Search additional potential procfs locations for current executable

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

Fixes build, which has been broken for all platforms (except BSD?) since
grandparent 406d9ba8.
Thanks to @SmallJoker for pointing out a solution.

Change types for passed password from wstring to string, which removes converting
back and forth in most cases. Move the narrow_to_wide conversion, where its neccessary,
closer to irrlicht. Remove trailing spaces in guiPasswordChange.cpp. Make parameters for
translatePassword passed as const reference.

Fixes path detection when compilers have been told to follow a standard, e.g. with -DCMAKE_CXX_FLAGS=--std=c++98.
To see the passed defines, try this with and without the --std parameter:
gcc -E -dM --std=c99 - < /dev/null | grep linux

Build broke since last commit 479f3897 for compilers not supporting C++11.
Pre C++11, the constructor of std::ifstream only allows C like strings.

NodeResolver name lists now belong to the NodeResolver object instead of
the associated NodeDefManager.  In addition to minimizing unnecessary
abstraction and overhead, this move permits NodeResolvers to look up nodes
that they had previously set pending for resolution.  So far, this
functionality has been used in the case of schematics for
serialization/deserialization.

We are only iterating sequentially, we don't need a set here
Also use a vector reference instead of a copy

If the player is disconnected while Lua API is doing a l_punch call, for example, the playersao is NULL and the server crash. Fix it.

Don't reinvent freetype detection, use working one from cmake.

This fixes a segfault when the database is shut down
before it finishes connecting and setting up.

Remove large cave checks for air
Mgv5/mgv7:Add is_ground_content checks to 3d noise tunnels
More large caves
Shorten lines

Fixes #2603

Also set the packet size at creation not when pushing rawString, no functional change

This greatly increases crafting performance, especially in worlds with many mods.

Approved by @kwolekr.

Introduces a hash-type-layered fall-through mechanism, where every layer specifies one hash algorithm,
and the "deeper the fall", the more collisions to expect for the algorithm. One Craft definition
only resides at one layer, which improves speed for lower layers (and a complete fail), due to most
craft definitions residing at high layers.

Due to the fall-through design, the undocumented behaviour that later craft recipes
override older ones had to be weaked up a bit, but craft recipes with the same hash and layer
will still override.

This seems to be a debug message which has been forgotten to be removed.

Approved by: @kwoelkr

Create PacketError exception and use it with ACTIVEOBJECT_REMOVE_ADD handler which can be unreliable