Full 'code' widget refactor to utilize controllers and cross controller event signaling

src/libs/dto/code/text_inserted_event.py

@@ -0,0 +1,15 @@
+# Python imports
+from dataclasses import dataclass, field
+
+# Lib imports
+
+# Application imports
+from .code_event import CodeEvent
+
+
+
+@dataclass
+class TextInsertedEvent(CodeEvent):
+    line: int  = 0
+    char: int  = 0
+    value: str = ""