Moved plugins and refactor command system

- Moved plugins to apropriate sub folders
- Refactor command system with new add_command method and rename GetCommandSystemEvent to GetNewCommandSystemEvent
- Add RegisterCommandEvent for dynamic command registration
- Change footer container orientation to VERTICAL
- Add search-highlight tag to source buffer
- Add file change detection (deleted, externally modified) in source_file
- Add JSON prettify option to source view popup menu
- Enable hexpand on VTE widget
- Update plugins_controller_mixin to use widget_registry

plugins/code/search_replace/plugin.py

@@ -0,0 +1,65 @@
+# Python imports
+
+# Lib imports
+import gi
+gi.require_version('Gtk', '3.0')
+from gi.repository import Gtk
+
+# Application imports
+from libs.event_factory import Event_Factory, Code_Event_Types
+
+from plugins.plugin_types import PluginCode
+
+from .search_replace import SearchReplace
+
+
+
+search_replace = SearchReplace()
+
+
+
+class Plugin(PluginCode):
+    def __init__(self):
+        super(Plugin, self).__init__()
+
+
+    def _controller_message(self, event: Code_Event_Types.CodeEvent):
+        if isinstance(event, Code_Event_Types.FocusedViewEvent):
+            self._handle_view_change(event)
+
+    def _handle_view_change(self, event: Code_Event_Types.FocusedViewEvent):
+        if search_replace.is_visible():
+            buffer = search_replace.active_view.get_buffer()
+            search_replace.clear_highlight(buffer)
+
+        search_replace.active_view = event.view
+
+        if search_replace.is_visible():
+            search_replace._find_entry_search_change(
+                search_replace.find_entry
+            )
+
+    def load(self):
+        footer = self.requests_ui_element("footer-container")
+        footer.add( search_replace )
+
+        event = Event_Factory.create_event("register_command",
+            command_name = "search_replace",
+            command      = Handler,
+            binding_mode = "released",
+            binding      = "<Control>f"
+        )
+
+        self.message_to("source_views", event)
+
+    def run(self):
+        ...
+ 
+
+class Handler:
+    @staticmethod
+    def execute(
+        view: any
+    ):
+        logger.debug("Command: Search/Replace")
+        search_replace.hide() if search_replace.is_visible() else search_replace.show()