Pluggable ":format"

[tolitius]

Currently the default configuration format is EDN, but cprop also knows how to work with .properies, so it make sense to add a reader for that.

Also nothing stops cprop to later know YAML or JSON or somethin more exotic, etc..

Needs more thinking and would probably look something like:

(load-config :format :lua)

(load-config :format :yaml)

with :edn be a default format.

(needs to be pluggable, so it is easy for others to contribute more formats)