New settings definitions and validators.

Will be used by a new settings.py parser.  In progress

overviewer_core/settingsDefinition.py

@@ -0,0 +1,30 @@
+# This file defines all of the things than can 
+# appear in a settings.py file, as well as the
+# function that can validate them
+
+# the validator should raise an exception if there
+# is a problem parsing or validating the value.
+# it should return the value to use (which gives
+# the validator an oppertunity to cleanup/normalize/
+# whaterver)
+
+# if a setting is not required, the validator is 
+# expected to return the default option
+
+from settingsValidators import *
+
+
+render = {
+    "path": dict(required=True, validator=validatePath),
+    "rendermodes": dict(required=False, validator=validateRenderMode),
+    "north-direction": dict(required=False, validator=validateNorthDirection),
+    "render-range": dict(required=False, validator=validateRenderRange),
+    "force-render": dict(required=False, validator=bool),
+    "stochastic-render": dict(required=False, validator=validateStochastic),
+    "imgformat": dict(required=False, validator=validateImgFormat),
+    "imgquality": dict(required=False, validator=validateImgQuality),
+    "bg-color": dict(required=False, validator=validateBGColor),
+    "optimize-img": dict(required=False, validator=validateOptImg),
+    "no-markers": dict(required=False, validator=bool),
+    }
+