preset: Remove unreachable statement
effects: Do not ignore defaultthumbnail.svg missing
effects: Cleanup a bit the construction of the useless title words regex
effects: rename
effects: Fix adding an element to a set
effects: pythonify
effects: Move effect categories to constants
effects: Simplify _getEffectCategories
effects: Moving All-effects and Uncategorized out of the categories list
effects: Remove dubious 'aware' parameter
effects: Stricter EffectFactory constructor parameters
effects: Get rid of some fields