v0.6.0

• Fix dead-lock for truncate call while file is in access.
• Do not reopen file handle when creating a new file (optimization)
• Rework cache invalidation logic to maximize cache reuse
• Use directory entry cache to check file existence
• Add negative cache
• Implement file locks to prevent race condition (e.g., renaming a dir while opening a file in the dir)
• Take file open mode argument for CreateFile operation