Fix two typos

[HazenBabcock]

This replaces PrepareSequenceAcqusition with PrepareSequenceAcquisition and g_Keyword_Meatdata_Exposure with g_Keyword_Metadata_Exposure. It touches a lot of files because the first typo is present in most of the camera device adapters.

[tlambert03]

Hey @HazenBabcock 👋, this is a duplicate of #453 ... see discussion there for hesitation on merge

[tlambert03]

i think i missed Meatdata 😂

[HazenBabcock]

Yes it is, apologies for that.. I should have checked the open pull requests first..

[marktsuchida]

No problem, we appreciate this!

I think the Meatdata will be better to fix by keeping the old name (deprecated) for now, so as not to break things that depend on MMCore (including pymmcore), which exposes it in its API.

[HazenBabcock]

I could make another pull request where Meatdata_Exposure and Metadata_Exposure are both set? Then once Meatdata_Exposure is fixed in the dependencies it could be removed?

[marktsuchida]

@HazenBabcock Yes, that would be perfect.

[HazenBabcock]

Closed, see #503.