Add syntax highlighting for the new Window methods

[SableRaf]

Processing 4 added new core functions to replace the surface methods as can be seen in the Beta 5 and Beta 7 release notes. These changes are also mentioned here https://github.com/processing/processing4/issues/53 and https://github.com/processing/processing-website/issues/335

According the README (and comments in the keywords.txt file found in the Processing4 repo) these changes have to be done in the keywords_base.txt file on the processing/processing-website/ repository (here).

[amit-62]

Hello @SableRaf can I work on this issue?

[SableRaf]

Hi @amit-62 feel free to look into it! A word of warning that this issue (https://github.com/processing/processing-doclet/issues/1) might be a blocker.

[amit-62]

Thank you @SableRaf, I will take care of this.