Merge topic 'check-jsoncpp-version'

80f3f3dd jsoncpp: mark that 0.7.0 is the minimum version
ecc67152 ThirdParty: add minimum version support
b5fc3409 FindJsonCpp: add version detection

Acked-by: Kitware Robot <kwrobot@kitware.com>
Reviewed-by: Utkarsh Ayachit <utkarsh.ayachit@kitware.com>
Acked-by: Sean McBride <sean@rogue-research.com>
Merge-request: !201