[BW]: [Ign] Changes to make compile successfully bitshare_toolkit project also in keyhotee configuration (as its dependency):
- mostly removed improper usage of include_directories statement, replaced with target_include_directories or automatically filled include directories because of link dependencies
- removed bad usage of CMAKE_SOURCE_DIRECTORY, always should be used CMAKE_CURRENT_SOURCE_DIRECTORY
Merge branch 'master' of https://github.com/BitShares/bitshares_toolkit