Heapdump cache files not deleted

[thurka]

Describe the bug
VisualVM allows to delete captured heap dumps. However it only deletes the heap dump file and the corresponding cache files in .hwcache directory are not deleted.

To Reproduce
Steps to reproduce the behavior:

1. Take a heap dump
2. Open heap dump
3. Find heap dump location
4. Delete heap dump

Expected behavior
.hwcache directory should be deleted.

[jisedlac]

Will fix to delete also the cache directory. However, it won't work reliably on Windows where some of the files cannot be deleted while the JVM runs, because they're memory-mapped.

[jisedlac]

Fixed.