Add @pmario's latest video

Part of addressing #770
Revert 6641d5c93f2ccffea77f82d48d1adc6e76809bf2
Improve comments and coding style
Merge branch 'master' of https://github.com/Jermolene/TiddlyWiki5
Fix indentation of selective expandable TOC

Fixing #768
remove server fields and calendar macro
restricted classic transclusion to type text/x-tiddlywiki
Extend keyboard handling

To cope with the Mac’s “meta” key (ie command/⌘) preparatory to
trapping command-S
Release note update
Merge pull request #673 from buggyj/tw2parser2

Tw2parser2
Release note update
Missed corrections of `tm-auto-save-wiki` message
Corrections of classes for tw2parser

@buggyj I assume these classes should be converted to the new format?
Preparing for 5.0.16
Version number update for 5.0.16-beta
Preparation for 5.0.17
Fix typo
Filter operator "removesuffix" docs correction
Fix typo
Fix tiddler keyboard shortcuts

Maddeningly, I broke them in 5.0.16-beta…