convert Docsify and mixins to ES classes

[trusktr]

Summary

Converts Docsify and its internal mixins to ES classes. The advantage is static typing: this change begins to allow IDEs like VS Code to know the shape of classes for type checking and intellisense, so devs can go-to-definition on methods, or see if they are passing the wrong data type (still needs work, but this is a first step).

Docsify-classes.mp4

What kind of change does this PR introduce?

Refactor

For any code change,

• Related documentation has been updated if needed
• Related tests have been updated or tests have been added

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

Related issue, if any:

Tested in the following browsers:

• Chrome
• Firefox
• Safari
• Edge
• IE

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[trusktr]

I had to run the test three times for them to pass. That's a bit annoying.

[trusktr]

this is good to go

[Koooooo-7]

I think It makes Docsify more readable with ES upgrade.
LGTM.

[trusktr]

Btw, if you turn on "hide whitespace" in the "files changed" tab, the diff is easier to see. Not too many actual changes besides whitespace indentation.

[sy-records]

If it doesn't affect previous users, it's fine.
LGTM.

[trusktr]

If it doesn't affect previous users, it's fine. LGTM.

Yep yep! Let's keep as much backwards compatibility as possible. The new Solid-SSR stuff will be compatible with v4