Add modules to Cardinal

[dromer]

I thought it would be good to start a topic with suggestions of modules that could be included.

Main guideline would be to try and pick only foss modules that allow redistribution of assets to make life easy on us.
Source should be CC0, GPL3+, MIT, or BSD and assets should NOT have CC-NC-like clauses.
(GPL3 currently works, but module vendors should be encouraged to use more permissive license for future versions of the GPL)

First suggestion is:
https://github.com/mhetrick/hetrickcv/tree/v2 - CC0 - has a lot of neat logic/binary like functionality

[falkTX]

This should be a discussion, not a ticket.
Also CC-NC restriction is too late, 99% of Rack modules use this.

There is also already a document describing the modules I will check out for addition soon, sorted by popularity.
https://github.com/DISTRHO/Cardinal/blob/main/plugins/todo.txt

I am writing an updated readme now, will put some rules for modules in there.