Support FMI 3.0

[markaren]

Just FYI, FMI 3.0 will be supported in the future.
Some refactoring is underway to accommodate this, but the actual FMI 3.0 support will not come before it's officially released.

[markaren]

Just to update any potential followers. As time has passed and the standard has not been released yet, and also because it seems that the difference between FMI 3.0 and 2.0 seems much bigger than 1.0 to 2.0 I cannot promise that this library will ever receive support for FMI 3.0.