Revision 1752033

Another major patch for OFBIZ-7534 replacing Ant with Gradle

This is the first patch that takes OFBiz to the point of no return
in terms of switching from Ant to Gradle build system. Specifically
this patch applies the following items:

- Delete all old Ant and Maven build scripts
- Delete 169 Jar libraries and replace them with remote ones in the
  gradle build script
- update the gradle build scripts for the dependencies and other minor
  changes needed for the script work correctly

All tests pass with the command ./gradlew cleanAll loadDefault testIntegration

Again, thank you for everyone who contributed valueble time and effort in this
process.