GHA

[wipe2238]

Various additions/tweaks/improvements related to repository Actions. Updated from time to time to not forget about something.

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• add lexx-friendly way to manually trigger worflows
  while there is dispatch.sh already, it runs under bash, so yeah... making same thing as .exe can be fun little project to refresh memory how to work with REST APIs in C#

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• sfall compilation as part of daily updates
  i'm removing AppVeyor installs from all organization repos soon, so whole setup has to be ported to Actions at some point
• playerify documentation
  package should be released with all README.md files renamed to README.txt and tweaked a little to get rid of some markdown/html syntax
  • [path](path) -> path
  • get rid of html used for images?
• disable sfall debug messages when creating release package
• when creating draft release, use NEWS.md as default text
• when creating draft release, previous draft should be removed
• convert all repository_dispatch scenarios to workflow_dispatch
• remove repository_dispatch triggers

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• https://github.blog/changelog/2020-10-01-github-actions-deprecating-set-env-and-add-path-commands/
• investigate newlines issue when creating release notes
• automate filenames normalization
  has to wait until fo1_LANG branches are merged into master (especially fo1_french)
• workflow_call
  https://github.blog/changelog/2021-10-05-github-actions-dry-your-github-actions-configuration-by-reusing-workflows/
• split schedule into multiple jobs