Bundle curated community plugins (2.1.8-4)

Vendored from upstream, pinned by commit (see debian/extra/README.source):
- gitstatus, gitopen, fontconfig, open_ext, select_colorscheme,
  smoothcaret, nerdicons (font mapping patched to DATADIR, Ships the
  Symbols Nerd Font Mono TTF, SIL OFL 1.1)
- lite-xl-lsp (complete LSP client; idle until a language server is
  configured) plus the lite-xl-widgets library it requires
- 104 language syntax plugins (none duplicate the nine bundled in core)

settings GUI left out upstream is broken: it requires a
libraries.widget.fonts widget that does not exist in
lite-xl-widgets at any revision.

Co-developed-with: ZCode (Z.ai)

debian/extra/README.source

@@ -0,0 +1,20 @@
+Vendored from upstream, pinned by commit:
+
+- lite-xl-plugins   https://github.com/lite-xl/lite-xl-plugins   @ 31eef29 (master, 2026-09)
+    plugins/: gitstatus, gitopen, fontconfig, open_ext, select_colorscheme,
+    smoothcaret, nerdicons, language_* (all 104; none overlap the ones bundled
+    in the core data/ directory)
+- lite-xl-lsp       https://github.com/lite-xl/lite-xl-lsp       @ d1432ae (master, 2026-09)
+    vendored whole as plugins/lsp/ (screenshots removed)
+- lite-xl-widgets   https://github.com/lite-xl/lite-xl-widgets   @ dcf1c8c
+    NOT vendored: only the settings plugin needs it, and settings@master
+    requires libraries.widget.fonts which does not exist in the widgets
+    repository at any revision, so settings cannot load. Revisit when
+    upstream publishes the missing widget.
+- nerdicons font mapping: plugins/font_symbols_nerdfont_mono_regular.lua
+    shipped as usr/share/lite-xl/libraries/font_symbols_nerdfont_mono_regular.lua
+    with the font path patched from USERDIR to DATADIR, plus the
+    Symbols Nerd Font Mono TTF (SIL OFL 1.1) next to it.
+
+Refresh by re-cloning the sources at a new commit and re-applying the single
+sed patch to the font mapping path.