Create TemplateMap at generation-time instead of at runtime

[WickyNilliams]

@herskinduk Perhaps a stupid idea, but thought it might be worth some consideration. Currently the ItemFactory (via ContainerProvider?) reflects on the target assembly and works out which template Types map to which template IDs. Instead of doing this at runtime (reflection, boo!), could we just spit out a static class of some sort at generation-time, since we know all of this information at that point?

Let me know your thoughts, good sir!

[herskinduk]

I guess this could be done by generating a class that implements IContainerProvider.

[WickyNilliams]

Good point I hadn't even thought of that! An implementation of IContainerProvider which wrapped some static dictionary, supplying the mappings.

Anyway was just a thought, would give better startup performance. We personally don't need it because we're still on the super early version of this. But it would definitely give me incentive to upgrade :)