Disperse siblings adjustments

[MrkBbl]

Is your feature request related to a problem? Please describe.

1. Dispersing siblings is not usable when one has a set exam date for example.
2. Dispersing siblings of native Image Occlusion "Hide all show one" is useless.

Describe the solution you'd like

1. It would be nice to be able to disperse the siblings within a set range for specific decks.
2. It should natively ignore these notes and not be dispersing them.

[L-M-Sherlock]

1. It's feasible in development. But the UI/UX is hard to design. I cannot figure out an elegant way to set the specific decks.
2. It will make the code more complex. I will consider it, but not in high priority.

[sweetins]

Is your feature request related to a problem? Please describe.

2. Dispersing siblings of native Image Occlusion "Hide all show one" is useless.

Describe the solution you'd like
2. It should natively ignore these notes and not be dispersing them.

I, personally haven't found it to be "useless". I think a better approach will be to allow the exclusion of a certain Notetype via an option. "Natively ignoring" will be too wild.