Input uses references when possible

[mockersf]

Objective

• As noted in https://github.com/bevyengine/bevy/discussions/14180, there's no reason for some of input methods to use T instead of &T

Solution

• Use references when possible for input
• Also update touches the same way for symmetry

Not using references is mostly not a problem in Bevy because most build in inputs are small types. It feels more correct to take references and it will be better for larger input types

[mockersf]

Wondering if this needs a Migration note since some public signatures changed.

yes it should...

But I'm not sure I like this PR. It's the right thing to do, but there soo many additional &...

[github-actions[bot]]

It looks like your PR is a breaking change, but you didn't provide a migration guide.

Could you add some context on what users should update when this change get released in a new version of Bevy? It will be used to help writing the migration guide for the version. Putting it after a ## Migration Guide will help it get automatically picked up by our tooling.

[BenjaminBrienen]

Has merge conflicts, waiting on migration guide