source code java8 compatible, adjust build files to reflect this #895
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update: while this one adresses the java.time issue as well, kindof, please prefer merging #899 instead.
hey @arnaudroques sorry for ovlerlooking that mvn and gradle had a differing source code compatible level:
https://github.com/plantuml/plantuml/runs/5049289268?check_suite_focus=true
am not sure if java7 was deliberate choice or just historic as i could not find why. so 2 options. this pr, making mvn require java8. and other pr, lowering to java7 for gradle.