Deleted all the folders that have been moved out into own repositories.

pmd-eclipse-plugin -> https://github.com/pmd/pmd-eclipse-plugin
pmd-jdeveloper* -> https://github.com/pmd/pmd-jdeveloper
website -> https://github.com/pmd/pmd.sourceforge.net
pmd-emacs -> https://github.com/pmd/pmd-emacs
everything else -> https://github.com/pmd/pmd-misc
Fix #1185 UnusedModifier throws NPE when parsing enum with a nested static interface
Fix #1165 SimplifyConditional false positive
Fix #1167 Error while processing PLSQL file with BOM
Fix #1188 False positive in UnusedPrivateField
Verify #1189 GuardLogStatementRule and GuardDebugLoggingRule broken for log4j2