Refactor loader code and add preliminary NCCH support

NCCH: Updated LoadExec to use Memory::WriteBlock function to load binary code.

Loader: Added ErrorNotUsed ReturnStatus type to specify when something is not used.

- Various cleanups/refactorings to Loader, ELF, and NCCH modules.
- Added AppLoader interface to ELF and NCCH.
- Updated Qt/GLFW frontends to check AppLoader ResultStatus.

NCCH: Removed extra qualification typos.

Loader: Removed unnecessary #include's.

NCCH: Improved readability of memcmp statements.

NCCH: Added missing space.

Elf: Removed unnecessary usage of unique_ptr.

Loader: Removed unnecessary usage of unique_ptr.

Adds OSX building on Travis-CI

citra_qt: Removed autogenerated files from repo and fixed build issues.

NCCH: Fixed typo in printing NCCH filename.

Conflicts:
	src/core/hle/function_wrappers.h
	src/core/hle/service/gsp.cpp

HLE: Moved "PARAM" and "RETURN" macros to function_wrappers.h (this is only module where they are needed).