Mexiko bootrom skeleton added
 Updated ROM module from de0 project, updated wb_intercon (need to regenerate) and orpsoc top
Generate bootrom.v
Initial work for Verilator support, still pretty sparse and CPU does not boot yet.
Makefile for Verilator, re-generated intercon - CPU boots
Added uart define. UART now works. Moved intercon to include directory.
Added compile timestamp in bootloader output
Merge remote-tracking branch 'origin/master' into soc

Conflicts:
	rtl/orpsoc/orpsoc.sv
ORPSoC part works on hardware.

- Removed timescale options from mexiko files
- Use emergency clk for now (80 MHz)
- Constrain system clock
- Updated design to use 80 MHz system clock and 115200 baud.

Known issues:
The bootrom cannot update the divisior for UART so we're
forced to use the builtin standard ones. No big deal, but
must be fixed eventually.