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_fe.lua

@@ -0,0 +1,52 @@
+-- mod-version:3
+local syntax = require "core.syntax"
+
+syntax.add {
+  name = "fe",
+  files = "%.fe$",
+  comment = ";",
+  patterns = {
+    { pattern = ";.*",                type = "comment"  },
+    { pattern = { '"', '"', '\\' },   type = "string"   },
+    { pattern = "0x[%da-fA-F]+",      type = "number"   },
+    { pattern = "-?%d+[%d%.]*",       type = "number"   },
+    { pattern = "-?%.?%d+",           type = "number"   },
+    { pattern = "'",                  type = "symbol"   },
+    { pattern = "=",                  type = "symbol"   },
+    { pattern = "<=?",                type = "symbol"   },
+    { pattern = "[%+-%*/]",           type = "symbol"   },
+    { pattern = "%f[^(][^()'%s\"]+",  type = "function" },
+    { pattern = "[^()'%s\"]+",        type = "symbol"   },
+  },
+  symbols = {
+    ["let"]    = "keyword",
+    ["if"]     = "keyword",
+    ["fn"]     = "keyword",
+    ["mac"]    = "keyword",
+    ["while"]  = "keyword",
+    ["quote"]  = "keyword",
+    ["'"]      = "keyword",
+    ["and"]    = "keyword",
+    ["or"]     = "keyword",
+    ["do"]     = "keyword",
+    ["cons"]   = "keyword",
+    ["car"]    = "keyword",
+    ["cdr"]    = "keyword",
+    ["setcar"] = "keyword",
+    ["setcdr"] = "keyword",
+    ["list"]   = "keyword",
+    ["not"]    = "keyword",
+    ["is"]     = "keyword",
+    ["atom"]   = "keyword",
+    ["print"]  = "keyword",
+    ["<"]      = "operator",
+    ["<="]     = "operator",
+    ["="]      = "operator",
+    ["+"]      = "operator",
+    ["-"]      = "operator",
+    ["*"]      = "operator",
+    ["/"]      = "operator",
+    ["nil"]    = "literal",
+    ["t"]      = "literal",
+  }
+}