Additional mouse support (Editor*)

[SuperDIMMaX]

Describe the project you are working on:
Any? - Editor*
Describe the problem or limitation you are having in your project:
Mouse button support and severals adds.
Describe the feature / enhancement and how it helps to overcome the problem or limitation:
Many mouse have extra button and work as - in browser, file maneger - back - forward.
And Mouse wheel if selected ScrollBar in editor not... working?

Describe how your proposal will work, with code, pseudocode, mockups, and/or diagrams:
back - forward in editor
Selectable ScrollBar with mouse wheel support
If this enhancement will not be used often, can it be worked around with a few lines of script?:
Often. can`t
Is there a reason why this should be core and not an add-on in the asset library?:
Expected behavior for users.

[Calinou]

Many mouse have extra button and work as - in browser, file maneger - back - forward.

Duplicate of #954.

And Mouse wheel if selected ScrollBar in editor not... working?

This is intended. Otherwise, you could end up accidentally modifying properties while scrolling in the inspector.