Improve preference sharing

[zulus]

For now is nighmare, especially sharing between servers

1. There are HTML, CSS, JS/TS preferences. Each one implemented manuly
2. HTML server read CSS preferences but completely ignore these from JS/TS
3. Vue could use HTML, LESS, JS, TS, SASS, CSS and others but each time have to implement manually
4. Same problems appear in case when we introduce some global preferences (format on save, insert mode, word matching settings)
5. There is no support for aliasing, for example typescript server embeded in HTML LS require different names

I think this can and should be simplified by:

1. Ability to use some informations directly from vscode package.json + some standard UI editors
2. Extensions that allow to register configuration sections adapters + default settings store (like settings.json in vscode)
3. Maybe in future support for settings scope (workspace and project level)

I don't know where this code should be store. I did some PoC during Vue implementation and can clean this for wildwebdeveloper.common, and/or should be prepared for LSP4E directly