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Add character set support for JS log viewer

Arran Walker requested to merge ajwalker/js-viewer-character-set-support into master

What does this MR do and why?

Adds VT100 character set support to the new JS log renderer.

In VT100 there's 4 graphic sets (G0, G1, G2 and G3).

These can be assigned a character set. Here I've only implemented US ASCII, UK ASCII and DEC Special Characters, and written a transformer that converts them to UTF-8.

G0 and G1 can then be assigned to the current graphic set by control codes SS2 and SS3.

G2 and G3 can temporarily be invoked for a single character from their assigned character set, this is done with N and O C1 codes.

The tests provide load character sets into the graphics sets, and then either changes the current graphic set, or invokes them temporarily.

Characters sets are really a legacy feature, and newer applications will likely output UTF-8.

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