feat: dart language barebones (fix #304) (#313)

Author: asurkov

src/main/kotlin/app/extractors/Heuristics.kt

@@ -413,6 +413,9 @@ val HeuristicsMap = mapOf<String, (String) -> ExtractorInterface?>(
             CommonExtractor(Lang.MAKEFILE)
         } else null
     },
+    "dart" to { _ ->
+        CommonExtractor(Lang.DART)
+    },
     "db2" to { _ ->
         CommonExtractor(Lang.SQLPL)
     },

src/main/kotlin/app/extractors/Languages.kt

@@ -18,6 +18,7 @@ object Lang {
     const val COMMONLISP = "lisp"  // Common Lisp
     const val CUDA = "cuda"  // Cuda
     const val D = "d"  // D
+    const val DART = "dart"  // Dart
     const val DOSBATCH = "dosbatch"  // DOS Batch
     const val DTRACE = "dtrace"  // DTrace
     const val ELIXIR = "elixir"  // Elixir

src/test/kotlin/test/tests/extractors/IgnoredSamplesWildcards.kt

@@ -80,7 +80,6 @@ var ignoredSamplesWildcards = listOf(
     "*/DIGITAL Command Language/*",
     "*/DM/*",
     "*/DNS Zone/*",
-    "*/Dart/*",
     "*/DataWeave/*",
     "*/Diff/*",
     "*/Dockerfile/*",