Added Meson build system support

[xvitaly]

Added Meson build system support.

[xvitaly]

Also path to shader file should be extracted from src/basalt.cpp#L25.

[DadSchoorse]

I do not know if I want a build system I do not use.

[xvitaly]

Now you don't use build system at all. Meson is much more better and will solve most of problems during build and install.

After merging this PR your project can be easily built and installed on any GNU/Linux distributions.

[DadSchoorse]

I do have make and simply speaking: It works, I do not need to modify it when I am adding new cpp or glsl files and I do not know to use and write meson. Maybe in the future I will reconsider this, but for now I simply see no reason to do so.

[stephanlachnit]

Maybe in the future I will reconsider this, but for now I simply see no reason to do so.

One reason are distribution packages. The current makefile makes this impossible, one could patch it to work but in the end once Meson is set in place, it's way easier to work with than make IMHO.