(scripts) rename/reorganize CLI scripts

- add torch MPS fallback directly to CLI.py
- rename CLI scripts with `invoke-...` prefix
- delete long-deprecated scripts
- add a missing package dependency
- delete setup.py as obsolete

ldm/invoke/CLI.py

@@ -21,6 +21,9 @@ import ldm.invoke
 # global used in multiple functions (fix)
 infile = None
 
+if sys.platform == 'darwin':
+    os.environ["PYTORCH_ENABLE_MPS_FALLBACK"] = "1"
+
 def main():
     """Initialize command-line parsers and the diffusion model"""
     global infile