Switched hprof parsing from AndroMat to perflib
Althought they are similar in spirit, all the APIs have changed.
No caching of the result of parsing the heap dump. This could lead to stack overflow errors, and we don't need it anyway since our use case is to always open a heap dump, parse it, compute a result and throw away the index files.
Replaces messages.properties resource with an enum, which should solve some Gradle configuration for projects that somehow can't see Java resource files.
Initial release.