Connector refactoring

[mkosunen]

Refactor rtl connector class

• Supports VHDL simulations with aprametrized widths
• Code simplified a lot: language specific classes utilize properties of the parent connector class directly, no need for connector_common class.

Ping @hosemiguelo10010001 @Roenski

@hosemiguelo10010001 this is the branch that shoul solve the problems on the course, please try. @Roenski if you can just run a bit more complex rtl sim to see that nothing broke.

[mkosunen]

Ping @Kovalevy . Could you also try to simulate something complex-ish.