#354 Enable project user and developer to disable the INSTALL_RPATH handling of BASIS.

A project developer can override the CMAKE_SKIP_RPATH setting in config/Settings.cmake. When set to TRUE/ON, BASIS will not set the INSTALL_RPATH property of executables and shared libraries. The option BASIS_INSTALL_RPATH can be used during the project configuration to have BASIS to configure the INSTALL_RPATH. If OFF, BASIS does nothing and lets CMake set this property.
Merge remote-tracking branch 'github/develop' into feature/#354-make-install-rpath-optional
Merge remote-tracking branch 'github/feature/#354-make-install-rpath-optional' into develop