Clean up codebase and improve file loading

- Moved plugins to proper sub groups (autopairs, code_minimap, colorize, commentzar, info_bar, markdown_preview, prettify_json, search_replace, tabs_bar, telescope, toggle_source_view, lsp_client)
- Add filter_out_loaded_files to prevent opening already-loaded files
- Add INDEPENDENT source view state
- Fix cursor scroll position on buffer switch
- Fix signal blocking during file load
- Fix word boundary in completion provider
- Refactor code events into single events module

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

@@ -0,0 +1,31 @@
+# Python imports
+import json
+
+# Lib imports
+import gi
+
+gi.require_version('Gtk', '3.0')
+
+from gi.repository import Gtk
+
+# Application imports
+
+
+
+def add_prettify_json(buffer, menu):
+    menu.append( Gtk.SeparatorMenuItem() )
+
+    def on_prettify_json(menuitem, buffer):
+        start_itr, \
+        end_itr = buffer.get_start_iter(), buffer.get_end_iter()
+        data    = buffer.get_text(start_itr, end_itr, False)
+        text    = json.dumps(json.loads(data), separators = (',', ':'), indent = 4)
+
+        buffer.begin_user_action()
+        buffer.delete(start_itr, end_itr)
+        buffer.insert(start_itr, text)
+        buffer.end_user_action()
+
+    item = Gtk.MenuItem(label = "Prettify JSON")
+    item.connect("activate", on_prettify_json, buffer)
+    menu.append(item)