Demo had the correct `text/x-vue`
defineMIME was using `script/x-vue`

There is, however, no `script/*` top-level media type:
http://www.iana.org/assignments/media-types/media-types.xhtml

Left, old `script/x-vue` for backwards compatibility.

Closes #4340

Closes #4333

To further underline our lack of commitment to having the
github repository serve as a package distribution mechanism.

When selecting at the beginning of a line ranges need to be removed
for new range to be added properly. (in Safari)

Closes #4308

Issue #4288

Issue #4289

Closes #4287

Closes #4325

Closes #4325

Because it has nothing to do with measurement.

And don't put indentation in css strings.

Issue #4312

And fix another bug introduced by 329b9e6e

Closes #4310

* commands are first in a line
* constants can contains more than `\w`, e.g. `${xml::CreateNode}`
* same goes for language strings

Closes #4297