Resolve type dependencies as per #357

[ssyram]

Added a new pass to resolve the type dependencies problem as mentioned in #357. The algorithm is generally as described but could be explained in more detail as that the type declarations come in the following order:

• All internal type forward declarations for structs and unions (but not enum, not type alias);
• All additional forward type declarations (will this happen? not sure, just for robustness);
• All enum type definitions --- as enum types are translated as alias of uint8_t, they have the property that: (1) they cannot be forward declared; and (2) they are standalone;
• All type alias in topological order: the above three should contain all possible types that can be referenced in type alias definitions;
• All struct/union type definitions in topological order: at this point all types that can be referenced in struct/union fields should be there;