Rename element-list to package-list
Rename element-list to package-list

This fixes https://github.com/gradle/gradle/issues/8183 as a workaround of https://bugs.openjdk.java.net/browse/JDK-8211194

Since JDK 11, javadoc's package-list file is superseded by element-list file, but a lot of external tools still need it.
This PR makes a workaround by manually copying element-list file to package-list file.

robinverduijn/gradle,robinverduijn/gradle,gradle/gradle,blindpirate/gradle,blindpirate/gradle,gradle/gradle,gradle/gradle,blindpirate/gradle,blindpirate/gradle,robinverduijn/gradle,gradle/gradle,gradle/gradle,robinverduijn/gradle,gradle/gradle,robinverduijn/gradle,blindpirate/gradle,robinverduijn/gradle,blindpirate/gradle,gradle/gradle,blindpirate/gradle,blindpirate/gradle,gradle/gradle,robinverduijn/gradle,gradle/gradle,robinverduijn/gradle,robinverduijn/gradle,blindpirate/gradle,robinverduijn/gradle,robinverduijn/gradle,blindpirate/gradle,gradle/gradle