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/file_state_watcher/plugin.py

@@ -0,0 +1,32 @@
+# Python imports
+
+# Lib imports
+
+# Application imports
+from libs.event_factory import Event_Factory, Code_Event_Types
+
+from plugins.plugin_types import PluginCode
+
+from .watcher_checks import *
+
+
+
+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.TextChangedEvent):
+            event.file.check_file_on_disk()
+
+            if event.file.is_deleted():
+                file_is_deleted(event)
+            elif event.file.is_externally_modified():
+                file_is_externally_modified(event)
+
+    def load(self):
+        ...
+
+    def run(self):
+        ...