AES: a spinal demo project

• From the template
• Added .scalafmt.conf for formatting, from the one of SpinalHDL but with only 80 columns (default) and with alignments 😃
• Added project/plugin.sbt for formatting via sbt
• Added .vscode/SpinalHDL.code-snippets for VSCode snippets
• Updated project name in folder name and build.*
• Using SpinalHDL@dev
• Updated .gitignore
• Added tb/ folder with same structure as hw/, for tests / simulation files
• Updated build.* with the new tb/ folder and to add HTML report generation (in simWorkspace/test-reports)

Use of snippets are put in comments. It is "full" use, so actually there was less keystrokes because of auto completion 😉

• Simple example of component in hw/spinal/aes/AddRoundKey.scala.
• More snippets, shown in hw/spinal/aes/Aes.scala, with idioms.
• Disabling formatting locally shown in hw/spinal/aes/SBox.scala.
• Component-as-function snippet shown in hw/spinal/aes/SBox.scala.
• App to simulate is in tb/spinal/aes/Simulate.scala.
• SpinalTestBench is in tb/spinal/aes/Simulate.scala.
• gtkw configurations are generated for each test, in tb/gtkw/, from tb/gtkw/Aes.gtkw using my deriveGtkw script.

As a result I get:

• simWorkspace/aes/aes should cipher example from class.fst from the SpinalTestBench
• simWorkspace/test-reports/index.html from SpinalTestBench

• sbt scalafmtCheckAll passed so all code is actual auto formatting.