Allow custom separator for multi-value properties to be specified in config.edn

[alex0]

Related:

An idea for a more standard-Markdown property syntax

The problem The syntax for properties: - key:: value has three issues: It’s confusing about how values are parsed (see documentation here): you can choose between multiple values or longer text with commas, but not both at the same time. It is limiting and very developer-oriented. Sometimes text is turned into pages and the user needs to figure out why; when you experience it it seems a bug. To use a block as a property value you need to save the block somewhere else and reference it with (…