2.4.26 major fixes

Fix DbTaskRunner LRU cache
Add option -Dopenr66.cache.limit and -Dopenr66.cache.timelimit
Improve Log in SpooledDirectory
Improve Directory and File implementation
Improve Shutdown for SpooledDirectory
Add programmatic support of equivalent of -Dfile.encoding=UTF-8
Use LongUuid support for SpecialId when no database is used
Improve LRU cache usage, lock and preventing deadlock in NetworkTransaction