The software is now able to create most interrupt combinations of
Section 9.9 of the SystemRDL 2.0 LRM. It supports
stickybit/non-stickybit interrupts, it support posedge, negedge,
bothedge, and level interrupts, and it is able to generate all
surrounding logic.
This commit also fixes a reset-bug that caused registers that were reset
to 0 to be not reset (because 'if not reset_value' will return True if
the 'reset_value' is 0).
Every single field and every single alias (!) has its own
interface to the surrounding hardware. This is required
to give users the maximum amount of freedom when defining
certain properties in RDL.