v0.17.0

• Added a "weak store" API providing weak reference for stores (typically used by background threads)
• Added Store ID API, e.g. getting a store by its ID
• Various internal improvements including minor optimizations for binary size and performance

C++

• New "OBX_CPP_FILE" define to place declarations in a single .cpp/.cc file: improves compilation time and results
• New "Exception" base class for all thrown exceptions
• Various internal improvements, e.g. a "internal" namespace to better distinguish from userland API