Replace json validator

jsoncdaccord appears to have force pushed their repo and removed all
history Despite having recent commits, it appears they no longer have
support. Replace the external sche

Replace json validator

jsoncdaccord appears to have force pushed their repo and removed all
history Despite having recent commits, it appears they no longer have
support. Replace the external schema validator with a minimal schema
validator that only implements the features that libcper uses. This may
be temporary until we find another well supported validator, but for the
moment, this seems like the best of the options.

Some files are pulled from jsondac, so that license is maintained.

Fixes #7

Tested:
Tests pass. No library changes.

Change-Id: I29872ce420850accecf6fa4372b4ede14b73250b
Signed-off-by: Ed Tanous <ed@tanous.net>

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