Parameter definitions refactor

[yamadapc]

Currently in swift, parameters are classes that combine both the parameter value with its definition (name, range, id). This is problematic, because for effects we need to have some dynamic parameters (since effects will be added into the graph dynamically).

This means we need to first be able to list a "parameter definition/spec" and then create a value which exists on the EntityId graph and corresponds to this instance of the parameter on a certain track and position.

This will require refactoring FloatParameter, IntParameter, etc to keep their declarations separate from their values.