GUACAMOLE-773: Allow automatic license generation to consider multiple dependency lists, not necessarily from Maven.

doc/licenses/guava-30.1.1-jre/dep-coordinates.txt

@@ -0,0 +1,3 @@
+com.google.guava:failureaccess:jar:1.0.1
+com.google.guava:guava:jar:30.1.1-jre
+com.google.guava:listenablefuture:jar:9999.0-empty-to-avoid-conflict-with-guava