Render Actions API

[IsaacMarovitz]

The render graph is constructed by Lua with each command being mapped to one of these RenderAction types. With this API we are free to view and modify the contents of the render graph without Lua modification. This has uses in both future modding applications, but also in patches and debug tools.

[hyperbx]

Move all size assertions below offset assertions.

[hyperbx]

Enums in the API must be prefixed with the name of the enum, as we don't support enum classes.

For example, in SetBlendMode.h:

Before

enum BlendMode
{
    Opaque = 0,
    Blend = 1,
    Add = 2
};

After

enum BlendMode
{
    BlendMode_Opaque = 0,
    BlendMode_Blend = 1,
    BlendMode_Add = 2
};

This should apply to all enums in this PR.