ffi_helper 2.1.0

Utility classes to make working with Dart's FFI a little bit simpler and more efficient.

1.0.0+

• dropped, shouldn't be used

2.0.0 - 2.0.0+2

• add thin Array wrapper to manage view into contiguous memory
• add Arena class for arena allocation
• add SharedArray for shared (reference counted) memory

2.0.1

• fix subclassing problem of Array

2.1.0

• Array gets a delete() method (just sugar for free(array.ptr))