[ST] Some updated for Structured Text Language support

[Serhioromano]

• Autoformat code beautifications added spaces before }
• Reorder some rules for better priority
• Update some Regex for a better match
• Added new rule to highlight variables after .

[alexdima]

Thank you!

[Serhioromano]

When you see monaco demo, and switch to the language, the demo code is loaded to the editor. Where do I save this? There is that piece of code? I've created example.iecst file in the root, how to make this load to the demo editor?

[alexdima]

@Serhioromano the samples live here -- https://github.com/microsoft/monaco-editor/tree/master/website/index/samples ... It would be great to have a PR with the .iecst file.

[Serhioromano]

Added but all extensions are TXT could not make file .iecst

[alexdima]

That's fine.