Eliminate add_target_property

We have a few CMake functions based on add_target_property that seem to have native CMake equivalents. We should use the native versions for simplicity and performance.

The replacements seem to be as follows (though I haven't investigated whether they are 100% equivalent for everything we do):

• add_target_compile_flags => target_compile_options
• add_target_link_flags => target_link_options
• add_target_compile_definitions => target_compile_definitions
• add_target_include_directories => target_include_directories