Flecs v3.0.4

This version includes the following bugfixes:

• Fixed issue where system created with each was not automatically instanced
• Fixed copy/paste error in term::read function that set the wrong inout kind
• Fixed issue that prevented deferring an emplace with types that had no default ctor
• Fixed issue that prevented on_add hook to be called for emplace
• Fixed issue where move_ctor wasn't called when merging deferred emplace
• Fixed issue where fps or thread count was overwritten when calling ecs_app_run
• Fixed issue where name prefix wasn't reset after bootstrap
• Fixed issue where union relationship wasn't properly initialized for prefab child
• Fixed various issues with using mingw
• Fixed wrong escaping of pipe symbol in documentation
• Fixed issues with enum reflection on clang and Windows
• Fixed issue with instantiating prefab children that are associated with root type
• Fixed issue where name lookup would fail after resetting name to NULL

This version includes the following improvements:

• Added constructor to flecs::query for creating named queries
• Rewrote outdated parts of "designing with flecs"
• Improved performance of ecs_count_id
• Improved performance of queries/observers that do relationship traversal
• Added query section to relationship manual
• Stats addon types now use customizable float type (ecs_float_t)
• Improved error message when using union relationship in C++ query signature
• Added overload for set_override where 1st element of pair is a tag
• Improved conversion logic of meta cursor API
• Improved documentation of ecs_new_id / ecs_new_low_id
• Updated outdated JSON examples
• Added entity::get_mut_second
• Improved performance of ecs_set

Known issues:
#765
#714
#620
#478
#314