Move to a mono repo

[nhatcher]

After a lot of discussions (thanks tronical), I think it is evident we will better of with a single repo that encompasses:

• The main engine
• Various importers/exporters
• Tironcalc
• python bindings
• web bindings
• nodejs bindings
• Web frontend
• Vs-code extensions
• Tauri desktop app
• ....

As I said the discussion is long as is the lists of pros and cons. But in a nutshell

Pros:

• We will move faster
• Inter dependencies are easier to spot
• We can test the whole thing (and the test coverage will be stronger)
• APIs will always be up to date.
• main means only one thing

Cons:

• The repository becomes bigger
• A minor change on a very small piece of code will require tests and builds of the whole system (ok, this is also a pro, wink, wink)

As an example already with the projects and milestones we are seeing some burden.

This will be easy to do now, but the sooner we do this the later. I think all other repos can be deleted and merged in here.

FYI: @fosdickio, @dg-ac