Handling of the --hide-ui-dir-config flag and added multi-platform code for opening a folder

Adds icons on the first 3 tabs to directly open the corresponding images output directory

* Update .gitignore to ignore *all* checkpoint files in /models
* Fixed typo in UI

support saving as half

Specify transformers version in requirements.txt

Token count

added eta parameter to parameters output for generated images
split eta settings into ancestral and ddim (because they have different default values)

(feat): Checkpoint merge using Inverse sigmoid interpolation

change the version of k-diffusion. It still won't be installed  unless you are installing from scratch, though.

- Provides a better user experience
- Better suited to variable list of options
- Keep the UI "stable" as list contract or expand

(feat): Rework Checkpoint Merger UI for better clarity and usability

Add Eta parameter to K Ancestral samplers

-Sort list of checkpoints in list

- Update checkpoint model fields labels

-Update the name of the model feilds
-Update the associated variable names