Input: Make macro chords work properly

[Glebux]

Description of Changes

Macros don't trigger if you only press one key of a chord anymore, fixes #8192

InputAxisEventHandler has InputBindingKey as an argument now
InputManager::SplitChord was made public
SetMacroButtonState was changed to check if all triggers of a macro were pressed before proceeding with the input

Rationale behind Changes

To make games that utilize pressure sensitive controls, like MGS3, playable on controllers that don't have it

Suggested Testing Steps

Test this on a windows system, because I don't have one

[github-actions]

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[F0bes]

Can you change the commit name to have a proper prefix?
Otherwise the code looks fine to me.

[Glebux]

Can you change the commit name to have a proper prefix? Otherwise the code looks fine to me.

Is this possible to reasonably accomplish using github, or I need to nuke my fork for this?

[F0bes]

You want to clone your branch locally and do
git commit --amend and set the commit message again.
You'll have to git push -f afterwards. If you aren't comfortable with that, I can do it for you.

[bslenul]

Maybe I misunderstood the PR but it doesn't seem to fix #8192 for me, as a test I set Shift+V as Circle and pressing either Shift OR V is sending a Circle input.

edit: forgot to mention but I'm on Windows 10 if it matters.