Buildsystem/CMake: Change policy CMP0005 to NEW and corect some buildvariables accordingly

** Info from CMake:
**   The OLD behavior for this policy is to place definition values given to add_definitions directly in the generated build rules without attempting to escape anything.
**  The NEW behavior for this policy is to generate correct escapes for all native build tools automatically.

If this breaks build, let us know on irc : irc.rizon.net/#trinity