Remove the need to update the unique-design-version entry in the build
option YAML file between builds to ensure successful FPGA programming.
An FPGA design version based on the date and time is generated when no
unique-design-version is specified simplifying interactive build/debug
cycles.

The build configuration YAML files describing a custom gateware
configuration will be used by the CI system generate bitstreams for user
custom FPGA designs.