add/fix infotext loading for builtin extensions

[DenOfEquity]

some simple changes, just busy-work really

for eight builtin extensions:

• save settings from process() not process_before_every_sampling() so they are written to params.txt too

for seven builtin extensions (latent modifier not changed):

• add/fix infotext loading (can't use .update with Gradio 4, this method works with v4 and v3)

for freeu:

• dropdown for presets for various sd versions, taken from /ChenyangSi/FreeU
• minor UI tweak, placed pairs of sliders into rows to use less space

[lllyasviel]

i will wait several days before merge this and hope that someone can test if this break things

[DenOfEquity]

I'll redo these individually, so it's not one big pile of changes.