* By replacing the goto operator with non-literal parameter
  by counting the read enabled with simple VHDL counters we
  can now replicate the properties instead of writing them
  all out.
* Decrease the data width to decrease run-time of unbounded proofs

ci: add GitHub Actions workflow 'Test'

* Remove unused SVA properties file
* Makefile optimizations
* Use prep auto-top option to prevent error with not founded top-level module
  when using generics
* Add some simple PSL assertions

* Add asserts for correct behaviour of Overflow flag
* Switch to smtbmc engine in prove mode (much faster than abc)

* Remove unused SVA properties file
* Makefile optimizations
* Use prep auto-top option to prevent error with not founded top-level module
* Rewrite assignments of Dout_o & Overflow_o as GHDL synthesis don't
  support concatenation on left side of assignments
* Add some simple PSL assertions