Loading an .exe image but not executing the entrypoint

[AudriusButkevicius]

Thanks for a great library

I'm using blackbone to map an .exe into memory, and using functions from the .exe as a library.
Currently there is no way to map the executable without executing the entrypoint.

A few other things that would be nice:

1. Expose each individual step of mmaping. For example I'd prefer mapping the image at it's preferred address via LoadLibrary. But I still need to perform tls init etc. It would nice if I could just point blackbone at an already loaded image, and do steps that I haven't done.
2. A method to init the CRT, but not invoke main would be nice.