Web cleanup (#539)

* Refactor generate.py and dream.py

* config file path (models.yaml) is parsed inside Generate() to simplify
API

* Better handling of keyboard interrupts in file loading mode vs
interactive

* Removed oodles of unused variables.

* move nonfunctional inpainting out of the scripts directory

* fix ugly ddim tqdm formatting

* fix embiggen breakage, formatting fixes

scripts/dream.py

@@ -620,6 +620,7 @@ def create_cmd_parser():
     )
     parser.add_argument(
         '-embiggen',
+        '--embiggen',
         nargs='+',
         default=None,
         type=float,
@@ -627,6 +628,7 @@ def create_cmd_parser():
     )
     parser.add_argument(
         '-embiggen_tiles',
+        '--embiggen_tiles',
         nargs='+',
         default=None,
         type=int,