Add mouse wheel changes for value inputs

[AlexBxl]

Overview

• How to deal with change precision? If the wheel does +1/-1 on every click, changing values like 1234 will not feel significant. I've found that in most cases the intuitive expectation is logarithmic -- the larger the value, the larger the per-click wheel changes.
• How to deal with touchpads? Two finger changes are possible, but care must be taken to minimize how it interferes with two-finger panning.