Moved plugins and add loaded file filtering

- Moved prettify_json and lsp_completer plugins to sub categories
- Add filter_out_loaded_files to prevent opening already-loaded files
- Refactor code events into single events module
- Fix signal blocking during file load operations
- Include READONLY state in source view lifecycle handling

plugins/code/event-watchers/prettify_json/plugin.py

@@ -0,0 +1,36 @@
+# 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 .prettify_json import add_prettify_json
+
+
+
+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.PopulateSourceViewPopupEvent):
+            language = event.buffer.get_language()
+            if not language: return
+
+            if "json" == language.get_id():
+                add_prettify_json(event.buffer, event.menu)
+
+    def load(self):
+        ...
+
+    def run(self):
+        ...