* I am not entirely sure whether it would be safe to bundle
  api-ms-win-core-synch-l1-2-0.dll or bcryptprimitives.dll,
  so I won't upstream this change yet.
* Should fix GTK/Win32 nightly builds.

* they don't have A_ITALIC
* should fix the nightly builds

* For instance, when using the Solarized color scheme,
  comments will be in italics.
* The underline style could also be supported in color.set,
  but currently it's not required.
* Unfortunately, this does *not* fix the INDIC_PLAIN indicator style for
  underlining, so you still cannot use that eg. for spell checking.
* See https://github.com/orbitalquark/scinterm/issues/22

* There are patches on top of Scintilla as were before
* Scinterm has been switched back to the upstream repository and there are unreleased
  commits - especially for out-of-tree builds.
* Lexilla hasn't been released since my troff lexer was merged.

* You no longer have to copy contrib/scintilla, contrib/scinterm and contrib/lexilla
  manually to the build directory.
* It turns out, that Scintilla/Lexilla was supporting this since 2016.
  Scintilla allows pointing to a source directory (srdir) and Lexilla to a binary directory (DIR_O).
* For Scinterm I opened a pull request in order to add srcdir/basedir variables:
  https://github.com/orbitalquark/scinterm/pull/21
* `make distcheck` is therefore now also fixed.
* The FreeBSD package is now allowed to build out of source.
  I haven't tested it yet.
* See also https://github.com/ScintillaOrg/lexilla/issues/266

This should not change anything functionally.

* The patch for indicator styles turned out to be unnecessary,
  so I switched back to the mainline Scinterm repository.
* Scinterm is now on the latest commit that still supports my version of Scintilla (v5.3.4).

* The scinterm submodule temporarily points to my own fork.
* This is necessary for the aspell macro on Curses.
  See https://github.com/rhaberkorn/sciteco/wiki/Useful-Macros#spell-checker
* See also https://github.com/orbitalquark/scinterm/pull/19