LIBS: Add the STLSoft lib

Header-only
GIT: Ignore all 'obj' directories

Regardless of depth
LIBS: Add fastformat library

Makes string formatting much easier and faster
GIT: Remove unnecessary ignore rules

Those extensions are Unix
PROJECT: Add build script for fastformat
LIBS: Make every fastformat configuration use C++ DLL runtime linking
PRECOMPILED_BINARIES: Host these on MediaFire instead of bloating the repo

Closes #14