Rework microarchitecture configuration files

[ryukzak]

Currently we support TOML files with very strange format. Examples: https://github.com/ryukzak/nitta/blob/master/examples/microarch.toml

We need to migrate (we don't need backward compatibility) on something more readable format based on:

• json
• yaml
• dhall (looks interesting and ok for experimental project, but may have problems with nice export)

Features:

• read microarchitecture from file with:
  • multiple networks
  • automatic
• write microarchitecture to file after / in progress of synthesis
• represent it on the UI

Also:

• rename uarch to march
• file format documentation
• migrate all microarchitecture examples to files (https://github.com/ryukzak/nitta/blob/master/test/NITTA/Model/Tests/Microarchitecture.hs),
  • read them via embedStringFile in tests.

The best starting point is rewrite current configuration in a new format.