removed .txt, .html and .xml files from custom Excel and TSV data lang. file mappings

Author: RandomFractals

package.json

@@ -74,7 +74,6 @@
         "id": "tsv",
         "extensions": [
           ".tsv",
-          ".txt",
           ".tab"
         ],
         "aliases": [
@@ -91,9 +90,7 @@
           ".dif",
           ".ods",
           ".prn",
-          ".slk",
-          ".xml",
-          ".html"
+          ".slk"
         ],
         "aliases": [
           "Excel"