Refactor ResourceSimpleArray

[carmineos]

ResourceSimpleArray currently inherits from ListBase which has a workaround to cache block length.
This actually isn't required as covariance isn't a problem in this case because ResourceSimpleArray is never used with blocks of type IResourceXXSystemBlock or blocks of variable length (except in ShaderParametersBlock_GTA5_pc which uses is temporary but won't use it anymore once IPackedBlock interface is implemented)

This means that we can be sure that block length is always Count * BlockLength of T
We should also consider refactoring all the base collections blocks to implement common .NET collections interfaces.