Implement --responsefile option for basisproject following ahundt's suggestion and initial implementation.
Fix basisproject to accept --responsefile option within response file.
Fix overriding of basisproject template options by default preset.
Fix default value for package vendor in BASISConfig.cmake.
#240 Modify basis_find_package to reset also <Pkg>-* variables when <Pkg>_DIR changed.
Improved error message when there is an error in the modify project mode.