Update to yew 0.20

[WorldSEnder]

This PR tracks the changes necessary to update to the eventual yew 0.20 release.
Upgrades:

• Use #[hook] on hook integration
• Use Renderer and features = ["csr"] in the examples

Closes #87
Closes #90

[cryptoquick]

Heads-up, the code in this PR no longer compiles, it gives this error:

   Compiling stylist v0.10.0 (https://github.com/WorldSEnder/stylist.git?branch=hooks#839dcc83)
error: cannot find attribute `hook` in this scope
  --> /home/hunter/.cargo/git/checkouts/stylist-45475ec210f96b03/839dcc8/packages/stylist/src/yew/hooks/use_media_query.rs:12:3
   |
12 | #[hook]
   |   ^^^^

error: cannot find attribute `hook` in this scope
  --> /home/hunter/.cargo/git/checkouts/stylist-45475ec210f96b03/839dcc8/packages/stylist/src/yew/hooks/use_style.rs:25:3
   |
25 | #[hook]
   |   ^^^^

error: could not compile `stylist` due to 2 previous errors

Using yew master on rev 5355b65ff5f9747cbad801d4b337a5ac7a94d0f4.

[futursolo]

Mostly LGTM.

I will line up a release tomorrow for 0.11.

Thanks.

[futursolo]

parser is actually enabled by default.

I am indifferent in disabling or enabling this by default.
I felt disabling this might be better but we do lose debug assertions on interpolation values. We can make the parser by default debug only, but there doesn't seem to be a way to exclude dependencies on release anyways so the benefit seems not big enough.

[WorldSEnder]

Hm you are right. Can we maybe internally consume stylist-core/parser (trusting the tree shaking and dead code elimination in release mode) but still only publicly expose the additional features with stylist/parser turned on?

The point being that the default might trick users into using the runtime parsing via the IntoPropValue impls, which causes unnecessary overhead.

EDIT: I see, power users wouldn't be able to get rid of the nom dependency.

[WorldSEnder]

Split the feature into parser for the public part and debug_parser for the debug assertions. Note that there were a few examples that mistakenly used the parser/runtime parsed styles in their <Global /> styles, and disabling this shaves some kB from the wasm binary ;)