Commit is being made to allow additions of GPL3+ code previously
un-addable. With these changes, contributions back to cuberite are
possible with the backporting exemtion, as well as adding stuff in
minetest with minetest code properly being read through and implimented
to upgrade it to GPL3 from GPL2.
project still has Apache2.0 license and credits to all its contributers, but now has the freedom of GPL3+ and all the code that can be implimented and shared with it.
Construct paths relative to the Cuberite sources with PROJECT_SOURCE_DIR, instead of wherever the first CMakeLists.txt file happened to be with CMAKE_SOURCE_DIR.
In Android's case, the latter was in a folder called android/ but that's not the root of the source tree, so any file path built off that root was wrong. This caused file-specific warnings exclusions to fail to apply.
* Replaces AppendVPrintf with fmt::sprintf
* fmt::ArgList now used as a type safe alternative to varargs.
* Removed SIZE_T_FMT compatibility macros. fmt::sprintf is fully portable and supports %zu.
* Adds FLOG functions to log with fmt's native formatting style.
