Added a nco_reset_ctrl function to mask nco_reset to certain blocks: dds and the signal to sync each RF channel first trigger units. RFNCO masks are unsupported in the FPGA (for now). There is also an ability to force a nco_reset with the soft option.

Fixed trigger_unit flip-flop to IOB register. Removed set_property direction from XDC, they're only valid during pin-planning.

Added OSERDES fine delay for nco_reset into RF clock domain and added reset logic with masks and lemo front panel connectivity