make it possible to activate highlighter only for specific file types

In stage 1 we use a glob pattern matching the file name.
Stage 2 (which I will maybe implement some day) might use some additional magic byte sequence for file type detection.

src/ui/bigtext/logFileModel.py

@@ -24,12 +24,13 @@ class LogFileModel:
     def __init__(self, file: str, settings: Settings):
         self.settings = settings
         self._file = os.path.realpath(file)
+        self._file_name = os.path.basename(self._file)
 
     def highlighters(self):
         all_highlighters = Highlighting.read_config(self.settings)
         active_highlighters = []
         for h in all_highlighters:
-            if h.is_active():
+            if h.is_active() and h.file_type_matches(self._file_name):
                 active_highlighters.append(h)
         return active_highlighters