Start migrating UiaCore to CsWin32

[elachlan]

Related: #7445, #9795

This is just a start, focusing on the enums. I mostly used find/replace and corrected any compile errors.

Microsoft Reviewers: Open in CodeFlow

[elachlan]

It looks like @lonitra has already started this at #10177

[elachlan]

I might be wrong actually.

[lonitra]

Changes LGTM, thanks for doing this! 🥳 The PR mentioned above only converts enums that are related to IRawElementProviderSimple, so definitely not the amount of enum conversion this PR covers. Did you have the chance to test changes by going through WinformsControlsTest with Narrator?

[elachlan]

It's all the enums. I didn't run through the narrator tests.

[lonitra]

We recently ran into an issue while converting UIA enums that metadata had defined their enums incorrectly. In that case metadata had defined enum as uint instead of int which caused Narrator to announce things incorrectly as it was expecting int. I think we are ok here, but it is good to make sure. I will pull down changes and test with Narrator some time today.

[elachlan]

I generally check ilspy to confirm all values are in the enums.

I'll make a note to check the data type as well.

[lonitra]

Just tested. Narrator seems to be announcing things correctly 🚀