Use standard build system

[WinterMute]

This PR replaces the cmake based build system with a standardised devkitPro Makefile which means that people can build it without installing cmake.

There's still a need to obtain makerom and bannertool but these should not be placed in the $DEVKITARM/bin folder and I'd appreciate it if build instructions didn't encourage people to place anything at all within the toolchain folders. We're currently looking into providing some tools to generate CIAs but that's going to be a little while yet.

[TuxSH]

Thank you ;)

I'll do two or three tests (should be fine because it's you :p) then merge this PR this WE -- I don't really have time to do dev stuff this week.

[TuxSH]

Nevermind, had a dozen of minutes to test it today; it's in fact easier than using CMake (here).

Some minor issues:

• make cia builds the .3dsx version as well, and make clean doesn't delete the generated CIA file.
• A typo: "TusxSH"
• Could you set APP_DESCRIPTION to "A tool to backup and restore save files from NDS cartridges (requires either PokeTransporter or Pokemon Dream Radar)" in the PR, please?

[TuxSH]

Thanks a lot :D.