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/plugins/language_lilypond.lua

@@ -0,0 +1,22 @@
+-- mod-version:3
+local syntax = require "core.syntax"
+
+syntax.add {
+  name = "LilyPond",
+  files = { "%.i?ly$" },
+  comment = "%%",
+  block_comment = { "%%{", "%%}" },
+  patterns = {
+    { pattern = "#%(()[%a_]%S*",          type = { "operator", "function" } },
+    { pattern = {"%%{", "%%}"},           type = "comment"  },
+    { pattern = "%%.*",                   type = "comment"  },
+    { pattern = "#[%w_-]*",               type = "keyword2" },
+    { pattern = "\\%a%w+",                type = "keyword"  },
+    { pattern = "\\\\",                   type = "operator" },
+    { pattern = "[%(%){}%[%]<>=/~%-%_']", type = "operator" },
+    { pattern = {'"', '"', "\\"},         type = "string"   },
+    { pattern = "-?%.?%d+",               type = "number"   },
+  },
+  symbols = {}
+}
+