Syntax highlighting for new function

[joente]

The next release of ThingsDB will include new functions:

• _arr_orset.map_id()
• _arr_orset.map_wrap(..)
• arr.map_type(..)

The return() and if() functions will be removed as they are replaced with statements

See branch/pull request: https://github.com/thingsdb/ThingsDB/pull/299/files

[AnjaBruls]

Added in release v1.2.2.