Cldc 491 rent and charges validations (part 1) (#388)
* move age validation tests to shared validation spec
* Add brent/tshortfall validation
* update period mappings
* Add scharge validation
* update num of weeks from period mapping
* fix test
* change period mappings in test
* Add tests for floats
* change error message content
* add supported housing scharge validation
* add other landlord validations
* refactor
* refactor validation and tests
* Add supcharg validations and refactor
* add total charge calculations
* move constants
* Fix tests and add missing validation messages
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