add custom error class. this allows us to fetch the raw message before it's been coloured.

src/simple_recorder/errors.py

@@ -0,0 +1,11 @@
+from clypi import ClypiException
+
+from .styler import error
+
+
+class SimpleRecorderError(ClypiException):
+    """Base class for all SimpleRecorder exceptions."""
+
+    def __init__(self, message: str):
+        super().__init__(error(message))
+        self.raw_message = message