Support the full rich-text spec

[L0laapk3]

Currently only a subset of rich text is supported. A lot of icons are not supported.

full rich text spec: https://wiki.factorio.com/Rich_text

If someone wants to contribute and start working on this, feel free to reach out to me on discord: L0laapk3#2010.

The commit below might also help you.

[L0laapk3]

example of not supported tag: [recipe=basic-oil-processing]

[L0laapk3]

This is what the following save file currently looks like: tagtest.zip