Bugfix update

Merge pull request #7 from soundvibe/2.1.3

Fixed deadlock when trying to update store while iterating.

Metadata write performance improvements

Merge pull request #6 from soundvibe/bloom-filter-io

Metadata write performance improvements

Remove for StoreWriter and StoreInitializer

• Added remove(key) to StoreWriter<K,V> and StoreInitializer<K,V>

StoreRW

• New StoreRW interface for reading and writing
• Simplified serializers
• Configuration is now using generics as well.
• Small performance improvements

Unlimited keys

• There is no key limit
• Duplicates can now be allowed

Index file close hotfix

• Fixed memory mapped files leak when closing the file

Major release

• Bumped minimal java version to java 13
• StoreReader and StoreWriter implement AutoCloseable
• New config builder
• Reader and writer use generics
• Reader is now fully thread-safe
• Bloom filters could be used for better performance
• Major code cleanup