[dev-context] CGModules update: vim syntax highlighting version 2020.04.25 published.

Aditya Mahajan submitted an update to the vim syntax highlighting package. Version number: 2020.04.25 License type: BSD License (simplified) Wants to be in ConTeXt distribution: yes Wants to be synced with CTAN: yes Summary description: This module uses Vim editor's syntax files to syntax highlight verbatim code in ConTeXt Announcement text: ---------------------------------------------------------------------- Added a new feature to escape in TeX mode using /BTEX .. /ETEX. This feature is enabled using `escape=command`. See the documentation for detailed iusage instructions. Thanks to Christoph Hintermüller for the implementation. ----------------------------------------------------------------------