Fixed some constraints. Some paths not constrained; eg no clocks on tmg_io pins, many CDCs go from fast into slow domains need reviewing to ensure pulse widths can be captured and latched.

Timing: added constraints for tmg_clk[1,2] and a script to analyse timing paths, identify some problems and apply a set_max_delay -datapath_only for synchroniser CDCs.

Script to find synchronisers, identify their clocks and periods, then apply an appropriate set_max_delay constraint. Rather than a set_false_path...

Generates a bitstream but no diag unit for t2

Timing is broken. False pathing inputs into CDC synchronisers (posedge searching). This helps timing, it's still broken, so more needs to be done.