Skip innerclass imports

[0880880]

Here is an example problematic struct:

typedef struct SDL_GamepadBinding
{
    SDL_GamepadBindingType input_type;
    union
    {
        int button;

        struct
        {
            int axis;
            int axis_min;
            int axis_max;
        } axis;

        struct
        {
            int hat;
            int hat_mask;
        } hat;

    } input;

    SDL_GamepadBindingType output_type;
    union
    {
        SDL_GamepadButton button;

        struct
        {
            SDL_GamepadAxis axis;
            int axis_min;
            int axis_max;
        } axis;

    } output;
} SDL_GamepadBinding;

jnigen imports

...SDL_GamepadBinding.input
...SDL_GamepadBinding.output
...SDL_GamepadBinding.input.axis
...SDL_GamepadBinding.input.hat
...SDL_GamepadBinding.output.axis

Here SDL_GamepadBinding.input.axis and SDL_GamepadBinding.output.axis collide and give an error

This fixes that by removing inner class importing and also changing instantiationType to give the name starting from the farthest parent