Get rid of the system-specific updatelocales.sh and introduce an
updatepo cmake rule. po files are also updated before creating the mo
files, and we now keep the .pot file (in the po/en directory). To
stabilize the po file creation, file contents are sorted by source
filename.

Update po files in the process.

The po file should not be named c55 if we're in ∆. But since it is not
exposed at installation time, we don't actually need its name to be
based on the project name at all, so just call it minetest.po

This unbreaks the Windows build which would otherwise have problems at
the jthread level.

When not running in place, check if the assumed data path in
../share/APPNAME exists. If it doesn't exist, fall back to ../data
instead. This allows the program to run successfully from the checkout
directory even without the run-in-place flag active.

german translation file
and bashscript to update translations

* liquid flow no longer does random things when transformed
* if a flowi
ng liquid node doesn't have a solid block as neighbor, its spread distan
ce is shortened by 1

Completely rewrote the liquid transformation. The algorithm now exclusively modifies the current node in one iteration. Another change is that MapNode.param2 now stores a bit that tells other nodes if a flowing liquid node flows downwards. This is accomplished by two masks on param2 for the "flow down" bit and the "liquid level" bits.

This will be the base of future improvements to the liquid flow. However, in the current state flowing liquid does not always disappear when cut off its source. Be aware that this branch is work in progress.

Hopefully fixed u64 to be the actual 64-bit type on 64-bit architectures. This should fix the compiler error caused by irrlicht on 64-bit fedora defining u64 to be different.

A small fix to an unlikely situation where the map generator requires a block that hasn't been loaded from disk. Now it is actually loaded from disk in that case.

Attempt to fix a problem with the factory mappings of objects residing in different source files than the prototype objects that fill them in