Release v0.6.0

Release v0.5.0

Merge branch 'master' of github.com:pulp-platform/axi

Add LICENSE

Add the LICENSE file and adjust the copyright headers across the
repository. The repository is part of the PULP project and as such was
intended to be released under that same license. The files until now
displayed the work-in-progress copyright header.

Also adjust the changelog and bump the version.

Update CHANGELOG and bump version to 0.4.2

Remove time unit declaration

Fixes an issue with the AXI interface driver.

Fix ID remapper, improve axi_join

Add multicuts

Add module to insert multiple cuts into AXI and AXI-Lite busses.

Remove factored-out files from manifest

Remove the `axi_find_first_one.sv` file from the manifest.

Bump version to 0.2.0