optinterpreter: organize the validation of arguments to be more readable
optinterpreter: organize the validation of arguments to be more readable

jpakkane/meson,mesonbuild/meson,jpakkane/meson,QuLogic/meson,mesonbuild/meson,QuLogic/meson,jpakkane/meson,mesonbuild/meson,pexip/meson,mesonbuild/meson,pexip/meson,mesonbuild/meson,pexip/meson,QuLogic/meson,pexip/meson,QuLogic/meson,QuLogic/meson,mesonbuild/meson,jpakkane/meson,mesonbuild/meson,pexip/meson,pexip/meson,pexip/meson,pexip/meson,jpakkane/meson,jpakkane/meson,QuLogic/meson,mesonbuild/meson,jpakkane/meson,QuLogic/meson,QuLogic/meson,QuLogic/meson,jpakkane/meson,mesonbuild/meson,pexip/meson,mesonbuild/meson,jpakkane/meson,pexip/meson