Add disting to pypi to release steps

CHANGES.md: Switch formating to proper markdown for last release (for…

… proper link support) and add release date.

CHANGES.md: Do 2024.08 release.

version: Bump to 2024.04.

setup.py/CHANGES.md: Prepare 2023.12 release.

Changes.md: Release 2023.08.

CHANGES.md: Release 2023.04.

litex_setup.py: Add --release argument to create a LiteX release with…

… a specific tag.

CHANGES: Update and release.

CHANGES: Do 2022.04 release.