where possible (everywhere except Windows) replace copying game file
with symlinking, on Linux do the same to CEF libraries.

Remove bundled CEF modules, leave only FindCEF for CEF_ROOT var
handling.

TRy to find system CEF module first.

Consolidate the general, platform-agnostic part of the main()/WinMain()
in static FCHost::main() function to avoid code duplication.

Probably ought to actually build the storage module, since it's pretty much the most important part of this whole thing.