- Model Preset initializes filename prefix with <PresetName>/
- New optional 'Output Filename Stem' field in flakes editor
- FlakeStack collects stems from all flakes and builds prefix:
- Folder stems (containing '/') are appended to path
- Date folder <YYYY-MM-DD> inserted after last folder stem
- Filename starts with <HH-MM-SS> followed by _ separated file stems
- FlakesGenerationData converter outputs filename_prefix as 6th pin
Closes#24