refactor: remove InfoBarWidget in favor of plugin-based one

- Replace direct InfoBarWidget with set_info_labels command that emits
  events to plugins
- Replace mini view widget in favor of plugin-based one
- Add widget registry exposure for code-container and editors-container
- Fix DND mixin exec_with_args call (tuple args issue)
- Add break statements in tabs_widget loops for efficiency
- Add _update_transparency call to BaseContainer

plugins/code/code_minimap/code_minimap.py

@@ -0,0 +1,50 @@
+# Python imports
+
+# Lib imports
+import gi
+gi.require_version('GtkSource', '4')
+from gi.repository.GtkSource import Map
+from gi.repository import Pango
+
+# Application imports
+
+
+
+class CodeMiniMap(Map):
+    def __init__(self):
+        super(CodeMiniMap, self).__init__()
+
+        self._setup_styling()
+        self._setup_signals()
+        self._subscribe_to_events()
+        self._load_widgets()
+
+        self.show()
+
+
+    def _setup_styling(self):
+        ctx = self.get_style_context()
+        ctx.add_class("mini-view")
+
+        self.set_hexpand(False)
+        self._set_font_desc()
+
+    def _setup_signals(self):
+        ...
+
+    def _subscribe_to_events(self):
+        event_system.subscribe(f"set-mini-view", self.set_smini_view)
+
+    def _load_widgets(self):
+        ...
+
+    def _set_font_desc(self):
+        default_font = 'Monospace 1'
+        desc         = Pango.FontDescription(default_font)
+
+        desc.set_size(Pango.SCALE) # Set size to 1pt
+        desc.set_family('BuilderBlocks,' + desc.get_family())
+        self.set_property('font-desc', desc)
+
+    def set_smini_view(self, source_view):
+        self.set_view(source_view)