rewrite: Absolute basics

[Friz64]

This PR intends to lay a groundwork for the rewrite.

Here are my changes

• Added an analysis crate, so that in the future code other than ash's generator can work with the API registry.
• Other small miscellaneous changes.

[Friz64]

Responding to early feedback about this PR, I've changed it to keep the old generator in the code base as a reference point and I've changed the base branch to master so that we have a working version of the current generator to build off of. Now we even might not even need to have a rewrite branch.

[Jerrody]

@Friz64
Very cool!

[MarijnS95]

Nice and simple, this should allow us to more easily compare the new generated version to the old one. Which of course only makes sense if the new one looks similar to the old one... and that is exactly the feedback I have heard/received over time: ash works well for many users as a low-level no-frills and they really wouldn't want to deal with (much) more API breakage nor see any need for it. In other words, and as said before I really don't intend to rewrite/redesign ash, only the generator needs to be rewritten to deal with increasing complexity in vk.xml resulting in an unmaintainable hunk of code. Changes to ash itself should mostly be incremental, such as perhaps autogenerating the hand-written helpers, including more/better documentation, properly guarding experimental APIs behind cfg and so forth.

For this PR that mainly comes down to leaving README.md intact, especially if we merge this to master instead of instantiating a special rewrite branch.

And if folks don't align with my view here, let's discuss. Incremental changes/improvements to ash is still rather broad, and I am open to breaking changes.

[Friz64]

Okay! Now it probably makes more sense to directly work from master, so: Reverted the README.md change.

[Friz64]

Looks like CI broke because raw-window-handle 0.5.1 got released with rust-windowing/raw-window-handle#107 which bumps its MSRV to 1.64.

[MarijnS95]

Ugh, I'm also running into that MSRV break on the ndk crate. Don't feel like bumping the MSRV for a patch dependency update (that we "could" opt out of) but raw-window-handle 0.5.1 provides some new features and drops cty in favour of the stabilized ffi types.

[MarijnS95]

@Friz64 I'm tackling the MSRV bump in #716 for just ash-window. In fact I think we might bump ash back down to 1.59 as I only bumped it to 1.60 for winit 0.28 initially which isn't used in ash's crate graph anyway (and 1.59 is still enough for #715 🥳).

[Friz64]

FYI I rebased this.

[MarijnS95]

Let's get it in then and get this show on the road!