cleanup: Remove unused import.
bugfix: Fixed crash when enabling cheats, after clean reinstall.

Bug introduced in commit b0ddd7029fd4d0dbbb6509345e4e9d9f039a0bb9.

Problem was that getHeaderCRC was being called without the required
native libraries loaded. They were being loaded in GameLifecycleHandler
static constructor, but apparently under certain conditions this static
constructor wasn't being called before getHeaderCRC was called.

Moving the library loading to CoreInterfaceNative static constructor
guarantees that the libraries are loaded before a native function is
ever called from Java, since all native functions are consolidated to
that class and the static constructor will be called before any static
methods.