Make installation undependable from tweaks

Updated copyright years ("better late than never" ahh change)

scripts/tweaks_manager.py

@@ -0,0 +1,58 @@
+import glob
+import os
+from scripts import config
+import importlib.util
+
+
+class TweaksManager:
+    """
+    Tweak manager class to load and apply tweaks from the tweak files in the tweaks folder
+    (I think this class manages the tweaks)
+    """
+
+    def __init__(self):
+        self.tweak_files = glob.glob(config.tweak_file)
+
+    @staticmethod
+    def load_tweak(tweak_file):
+        """
+        Load the tweak module        :return:
+        """
+
+        is_executable = os.access(tweak_file, os.X_OK)
+        if not is_executable:
+            os.chmod(tweak_file, 0o755)
+
+        if os.access(tweak_file, os.X_OK):
+            spec = importlib.util.spec_from_file_location("tweak_module", tweak_file)
+            module = importlib.util.module_from_spec(spec)
+            spec.loader.exec_module(module)
+            return module
+
+        return None
+
+    def define_arguments(self, parser):
+        """
+        Define arguments for the tweaks
+        :param parser: ArgumentParser object
+        """
+
+        for tweak_file in self.tweak_files:
+            tweak_module = self.load_tweak(tweak_file)
+
+            if tweak_module:
+                tweak_module.define_arguments(parser)
+
+    def apply_tweaks(self, args, theme, colors):
+        """
+        Apply the tweaks
+        :param args: parsed arguments
+        :param theme: Theme object
+        :param colors: colors.json object
+        """
+
+        for tweak_file in self.tweak_files:
+            tweak_module = self.load_tweak(tweak_file)
+
+            if tweak_module:
+                tweak_module.apply_tweak(args, theme, colors)