Add support for meson build system.

For now, let's keep support for both - autotools and meson.

Everything builds correctly now with all tests passing.

Fixes #653 (closed)

Still needs to:

• add support for static build (Done)
• add support for fuzz targets (Done)
• verify translation files generate correctly
• verify and fix formatting of the meson.build (Done)
• add CI job to compile and run tests using meson (Done)
• verify ninja dist contains everything (currently missing generated translation files)