mod: syntax highlighting: Improve syntax highlighting - Add some keywords (#457)
mod: syntax highlighting: Improve syntax highlighting - Add some keywords (#457)

* Add `goto` keyword

Mod:
- Add `goto` keyword (on `line begin keywords`)

* Add timing's keyword `binary|clock|concise|robust`

Add timing's keyword (on `line begin keywords`):
- binary
- clock
- concise
- robust

Source [timing-diagram](https://plantuml.com/en/timing-diagram)
qjebbs/vscode-plantuml,qjebbs/vscode-plantuml,qjebbs/vscode-plantuml