improt freeimage dep from ogre, as they use cmake because they're smart

but freeimage upstream is retarded as shit and uses (a) CVS and (b)
raw make files, not even autotools..and I couldn't figure out how
to set a custom install path easily. talk about the stone age..

anywho, now I added the various targets as dependencies, improved protobuf
detection as well. it is presently not linking to freeimage right now,
however.
lets try not using freeimage, instead i'd like to use SDL_image

i can't recall if it works correctly with sdl 2 but we shall see.

I would also like to use WebP, which is by far superior to PNG even,
and I like leveraging modern technologies.
actually rm freeimage
fix SDL_image compilation failure (actually exists upstream apparently,

story of my life..). remove freeimage and get it compiling without it.

few libs down..lots more to go :(
add libwebp, we'll be using it instead of PNG, just for shits