on non debug, check assets folder in src as well

silently fixing a bad malloc here too shhhhhhhhh

Generates zips only at the moment

running is another story

It is really messy at the moment. There is no support for copying the
necessary frameworks and dylibs out to the bundle for distribution, and
it is a frankenstein of manual find_library and find_package which can
sometimes pick up Homebrew dylibs.

Compiles the SDL2 target on Windows successfully