Drop the in-repo testSax folder

The four .sax test files live in EditorTestSax under the Sedona test
apps directory; the copies here were byte-identical duplicates and no
code referenced them.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

app_state.py

@@ -8,7 +8,7 @@ so later rebinding would only ever be seen by the module that did it.
 import configparser
 import os
 
-VERSION = "0.0.0.053"
+VERSION = "0.0.0.054"
 PROPERTIES_FILE = os.path.join(os.path.dirname(os.path.abspath(__file__)), "editor.properties")
 DEFAULT_GRID_SIZE = 10
 DEFAULT_ADD_TIMESTAMP = True