Fix get_conds_with_caching()

split some code from ui.py into ui_settings.py ui_gradio_edxtensions.py
add before_process callback for scripts
add ability for alwayson scripts to specify section and let user reorder those sections

rework hires prompts/sampler code to among other things support different extra networks in first/second pass
rework quoting for infotext items that have commas in them to use json (should be backwards compatible except for cases where it didn't work previously)
add some locals from processing function into the Processing class as fields

add slider for token merging for img2img
rework StableDiffusionProcessing to have the token_merging_ratio field
fix a bug with applying png optimizations for live previews when they shouldn't be applied

Should fix #10416

rework Negative Guidance minimum sigma to work with AND, add infotext and copypaste parameters support

rename CPU RNG to RNG source in settings, add infotext and parameters copypaste support to RNG source