Do not stop update/draw on window minimized

WARNING: SetConfigFlag() was reviewed to support int flags

Reviewed comments

With v2.5.0 out, increment API_VERSION, so binaries dynamically linked
against the released raylib aren't accidentally paired with a development
or later released raylib that may be incompatible.

Removed unused code for CAMERA_THIRD_PERSON.

Updated CAMERA_THIRD_PERSON

Allow to reconfigure stdin to read input keys, this process could lead to undesired effects. Use with care.

Disabled by default.

Added comments for the future

From the Clang documentation[1]:
> -x<language>, --language <arg>, --language=<arg>
> Treat subsequent input files as having type <language>

Follow the advice. Fixes #840.
[1]: https://clang.llvm.org/docs/ClangCommandLineReference.html

This reverts #841 commit 97160fd970.