Prettify Sequence diagrams #84
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I've only really touched the Sequence diagrams.
Added a UNICODE filled arrowhead (both left & right), A vertical bar with either a left or right fork, and updated the 'dashed' character(s) for a little bit of a prettier look.
Also modified Screen::ASCIIfy() to include the newly added UNICODE chars and substitutions. Changed ASCIIfication of the vertical-t to just a plain vertical bar, matching the same done with the horizontal-t being replaced with a minus sign.
Added dotted lines to the last two examples (run "diagon Sequence --examples" to see).
Some Images
UNICODE (in VSCODE in WSL2)

ASCII
