[linux] ControllerInterface map reworked to a static getter

[denvoros]

This is a weird fix. When running on Linux, the ControllerInterface map ALL_CONTROLLER_INTERFACES was causing weird segfaults during program initialization before even hitting main. Seems like gcc on Linux was causing initialization order of static and global variables to not consider initializing some ControllerInterfaces before actually storing them or allocating the memory. Anyway, this fixes a big hurdle for Linux support.

NOTE: I haven't tested this on any other compilers or OS's, but the change is pretty minimal since ALL_CONTROLLER_INTERFACES is only used with InterfaceType::register_factory.