cmake & pep8 tidy up, also some style edits.

remove unneeded collection length function.

release/scripts/modules/bpyml_ui.py

@@ -25,9 +25,11 @@ from bpyml import TAG, ARGS, CHILDREN
 
 _uilayout_rna = _bpy.types.UILayout.bl_rna
 
-_uilayout_tags = ["ui"] + \
-    _uilayout_rna.properties.keys() + \
+_uilayout_tags = (
+    ["ui"] +
+    _uilayout_rna.properties.keys() +
     _uilayout_rna.functions.keys()
+    )
 
 # these need to be imported directly
 # >>> from bpyml_ui.locals import *