Initial meson support

Using the library() function instead of shared_library() allows changing
of the library type via the default_library option.
This allows for easy change between static and dynamic library building.

Use 'meson --default-library=static builddir' to build as static, if no builddir yet exists.
Use 'mesonconf -Ddefault_library=static builddir' to change the type for
an existing builddir.

Fix link in readme

Accept external CFLAGS

Some distributions build the programs with a specific set of CFLAGS.
Lets allow that by adding raylibs flags.

Issues when pausin musing and trying to resume (not resuming!)

Setup for a new amazing feature! ;)

Reviewed comments and added acknowledgements

Move raylib history to another file