[WFCORE-2109] Require Maven 3.3.1+ and introduce mvnw* Maven 3.3.1+ is required by the Enforcer Plugin* mvnw (a.k.a. Maven Wrapper) is a script that downloads and installs(if necessary) the required Maven version to ~/.m2/wrapper and runs itfrom there. "mvn -N io.takari:maven:wrapper" was used to create all thenecessary files. The same command can be used in the future to upgradeto a newer wrapper version. Maven version used by the wrapper is storedin .mvn/wrapper/maven-wrapper.properties* .mvn/jvm.config is a place where Maven 3.3.1+ looks for JVM parameters(memory, etc.) which were traditionally defined in the MAVEN_OPTSenvironment variable.