Trying to resolve a path with RemoveRelativePathComponents that can't
be resolved without leaving leading parent components (e.g. "../worlds/foo"
or "bar/../../worlds/foo") will fail.  To work around this, we leave
the relative components and simply remove the trailing components one
at a time, and bail out when we find a parent component.  This will
still fail for paths like "worlds/foo/noexist/../auth.txt" (the path
before the last parent component must not exist), but this is fine
since you won't be able to open a file with a path like that anyways
(the O.S. will determine that the path doesn't exist.
Try `cat /a/../etc/passwd`).

This used to return "/foo" for "../foo" when it should return the enpty
string (i.e., error removing all relative components).

This commit makes the game load blocks only if they are not in the
memory.

The actual menu default comes from defaultsettings.cpp.

As mgv7 is now the default mapgen i re-checked its tunnel width on request,
discovered they needed to be wider, and have made this change.
This commit widens the identical 3D noise tunnels in the other mapgens in
exactly the same way.

Currently translated at 38.1% (350 of 918 strings)

Currently translated at 98.9% (908 of 918 strings)

Currently translated at 94.7% (870 of 918 strings)

Currently translated at 26.2% (241 of 918 strings)

Currently translated at 56.3% (517 of 918 strings)

Currently translated at 56.2% (516 of 918 strings)

Currently translated at 56.1% (515 of 918 strings)

Currently translated at 69.4% (638 of 918 strings)

Currently translated at 58.6% (538 of 918 strings)

This is a merger of 2 commits.

Currently translated at 58.6% (538 of 918 strings)

Currently translated at 58.6% (538 of 918 strings)

Currently translated at 100.0% (918 of 918 strings)

Currently translated at 100.0% (918 of 918 strings)

This is a merger of 4 commits.

Currently translated at 97.7% (897 of 918 strings)

Currently translated at 59.5% (547 of 918 strings)

This is a merger of 2 commits.

Currently translated at 41.6% (382 of 918 strings)

Currently translated at 41.2% (379 of 918 strings)

Currently translated at 53.8% (494 of 918 strings)

This is a merger of 2 commits.

Currently translated at 5.6% (52 of 918 strings)

Currently translated at 5.6% (52 of 918 strings)

Currently translated at 1.5% (14 of 918 strings)

Currently translated at 1.5% (14 of 918 strings)

Currently translated at 3.3% (31 of 918 strings)

Currently translated at 2.8% (26 of 918 strings)

Currently translated at 2.7% (25 of 918 strings)

Currently translated at 1.7% (16 of 918 strings)

Currently translated at 1.6% (15 of 918 strings)