Update ACE Codeeditor to reflect actual CSS syntax

[josch0]

Winter CMS Build

1.2

PHP Version

8.4

Database engine

MySQL/MariaDB

Plugins installed

No response

Issue description

The ACE codeeditor in the backend

Steps to replicate

The ACE code editor in the backend is extremely outdated. This is particularly noticeable in that the syntax highlighting when editing CSS marks all newer CSS rules (variables, nested CSS) as invalid.

While this does not prevent you from editing CSS assets, it is still not ideal and not correct.

Therefore, it is certainly a low-priority bug, but one that should be addressed at some point.

Workaround

No response

[LukeTowers]

@josch0 I'd like to address this by getting #431 merged