libfsobasics: add FileHandling.readIfPresent(); this one will not emit a warning, if requested file is not present
libfsobasics: add FileHandling.readIfPresent(); this one will not emit a warning, if requested file is not present

slyon/debian-fso-deviced,slyon/debian-fso-deviced,slyon/debian-libfsoframework,slyon/debian-libfsoframework,slyon/debian-fso-usaged,slyon/debian-fso-usaged