Properties & Bases: Support multi-level YAML (Mapping of Mappings, nested attributes, )

Another plus one for this! I use YAML frontmatter to track habits on daily notes. So, I have a number of properties that look something like this:

habitCategory:
  habit1: 0
  habit2: 1
  habit3: 1
  ...

A few automations also interact with that frontmatter. I could change those, but the bigger problem is that the properties currently look like this:

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