Before, minetest.request_shutdown didn't shut down
singleplayer instances or server instances from the server tab.

This commit fixes this. Fixes #3489.

-> Redis backend: break from switch to fix bug
-> Dummy and redis backends: reserve the count so that creating the list is faster

The freehoster these files were hosted on is shutting down soon-ish, they're now hosted on my VPS.

Before, sub-makes called by make were called without make knowing they
were sub-makes. This however led make's jobserver not do its tasks,
and the build process ended up with inefficient parralelisation. This
commit fixes this by applying the two ways the make manual tells
about: putting + to the start of the line (used when ndk-build is
invoked), and exchanging "make" with "$(MAKE)".

Before, make complained with messages like:

make[2]: warning: jobserver unavailable: using -j1.  Add `+' to parent make rule.

This complaint can now only been seen for openssl. openssl has issues
if make gets exchanged with $(MAKE): if exchanged, above error message
is multiplied for various subdirs of the openssl source tree.

On a 4 core box, "make -j 4" build time from "make clean_all" cleaned
source tree could be improved from 15:34 minutes to 10:45 minutes.
This means a speedup of 45%.

Currently translated at 43.8% (345 of 787 strings)

Currently translated at 40.0% (315 of 787 strings)

Currently translated at 95.1% (749 of 787 strings)

Squashed two translation commits to one

Currently translated at 48.7% (384 of 787 strings)

Squashed two translation commits to one

Currently translated at 43.8% (345 of 787 strings)

Currently translated at 56.6% (446 of 787 strings)

Squashed two translation commits to one

Currently translated at 59.7% (470 of 787 strings)

Currently translated at 3.1% (25 of 787 strings)

Currently translated at 39.8% (314 of 787 strings)

Currently translated at 49.0% (386 of 787 strings)

Squashed two translation commits to one

Currently translated at 11.4% (90 of 787 strings)

Currently translated at 30.7% (242 of 787 strings)

Squashed two translation commits to one

Currently translated at 23.7% (187 of 787 strings)

Currently translated at 42.0% (331 of 787 strings)

dcb91cf0 hacked around the biggest issue
this caused, but wasted a lot of CPU time and disk space  It also still
included a lot of other unwanted files.  This removes all of `doc/` except
the license, and also removes the server list.

Previous commit

70ea5d55 "Add support for limiting rotation of automatic face movement dir entitys"

by sapier has broken minetest's feature to open worlds. This was due to a
missing stack pop operation.

Thanks to @oleastre for reporting this bug and suggesting the fix.

or change the nametag text of players

3D Mandelbrot/Mandelbar
3D Christmas Tree
3D Mandelbulb
3D Cosine Mandelbulb
4D Mandelbulb
Plus corresponding julia set for each
Add credits for formulas
Rename parameter 'formula' to 'fractal'
Speed optimisations

Fix android build since commit

696148e2 "Fix Event implementation"

by @ShadowNinja.

Fixes #3444. Thanks @kwolekr for pointing out the fix.

* Horizontal and vertical are used wrongly. Use height and width because
	horizontal/vertical describes different things. Thanks @kilbith for pointing out.
* Update minetest.conf.example and settings_translation_file.cpp
* Correct maximum/minimum copy paste mistake.