Typescript Update

[chpolste]

Move the codebase to Typescript and improve stability and convenience.

Flottplot:

• Convert the project to Typescript
• .fail accepts error object and reports proper error type
• Better error reporting and placement
• Recursion detection in action invocation
• State of calendar
• Allow use of : in format specifier (for time)
• Verify that right/left slice is implemented properly
• Fall back to input text in toString if possible

Documentation:

• Scrolling of sidebar in documentation when window is not tall enough
• Docs in their own folder
• Tutorial
• Auto-generate demos from pre content
• Value examples (computation and formatting)

Project:

• Set-version script
• Extract TS dependencies for Makefile rules
• GitHub Action to run unit tests after every push
• GitHub Action to deploy documentation
• Fix asset copying for python package