v0.11.0

• update CMakeLists.txt to simplify integration for users, e.g. with FetchContent,
  see the updated installation docs
• change cursor and box read functions get/first/current/next void** argument to const void**
• change multiple query and query builder functions int count argument to size_t count
• change observer signatures (obx_err return value and size_t count argument)
• new obx_model_entity_flags()
• new obx_opt_async_*() to configure async box behavior
• new greater-or-equal and less-or-equal query conditions for integers and floats
• new obx_query_offset_limit() setter for offset and limit in a single call
• new obx_sync_available() to check whether the loaded runtime library supports ObjectBox Sync
• clean up linter warnings in the examples and objectbox.h(pp)

C++ (only)

• rename objectbox-cpp.h to objectbox.hpp
• change C++ Store Options to a "builder" pattern and expose all available options
• new C++ AsyncBox and Box::async() to expose asynchronous operations