* updated java indexer dependencies
* replaced old gradle tooling jar that is shipped with Sourcetrail because it is not working for new JRE versions anymore
* fixed crash in Java indexer
* added language standard sleection for Java 13, 14 and 15
* fixed console logging for recent jdk versions
* added implementation for Gradle project setup (icon is still missing)
* refactored project loading/saving and SourceGroupSettings
* removed long deprecated Cxx UseSourcePathsForHeaderSearch option
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* fixed java indexer to continue working when a dependency path does not exist
* updated JavSymbolSolver with a lot of fixes for solving types that are defined inside jar files
* update JavaSymbolSolver to version 0.6.0
* moved to Javaparser 3.3.0
* fixed solving type parameter names in symbols solved in jar files
* implemented ignoring name contexts in javassist and jre based method signatures to break infinite recursion