FS: Added stubbed code to intercept and decode file system service functions.

FS: Added to CMakeLists.txt
Loader: Refactored interface such that data is no longer stored by loader.
APT: Added stubbed ReceiveParameter and various cleanups.

APT: More cleanups.
FileSys: Added preliminary support for applications reading the RomFS archive.
Qt: Updated open dialog to include NCCH formats.