Align to Maven 3.6.3, update plugins, tidy up plugin versions. #263
+168
−105
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Concentrate ALL plugin versions in one single place: build/pluginMgmt
Note: plexus-utils was 4.0.0, downgraded it to 3.5.1 to make sure Maven3 compatibility. p-u 4.x is for Maven4 stuff, and while Maven4 is backard compat is fine using p-u 3.5.1, older Maven3 versions may squeak with p-u 4.x. If you target Maven3 compatibility in plugin (and currently you do), better use 3.x line of p-u.