and adds the xù specific keyword 'xu'

Closes #4345

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 #4325

Closes #4325

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

Closes #4256

To make closebrackets work with this mode

Closes #4277

Closes #4276

- remove non-swifty keywords
- remove repeated keywords
- rearrange in more logical way

Closes #4255

Closes #4254

Closes #4214

Closes #4212

Closes #4244

`Jenkinsfile` is used in Jenkins 2.0 for defining your pipeline as code.

See https://jenkins.io/doc/pipeline/jenkinsfile

Closes #4220

Closes #4188

Closes #4201

Closes #4190

Issue #4188

Closes #4185

Issue #4178

So f-strings get terminated correctly