Predictable release

[kivutar]

The Makefile currently downloads the latest cores from the libretro buildbot during the build.

These cores may be at some point in time buggy.

We need to find a way to always pull an exact version of these cores.

In Ludo, the user shouldn't be in charge of testing and choosing the right cores and core versions. We have to do it for them in a reliable way.

[Zewwy]

Loading custom cores will still always be an option though, right?

[RobLoach]

Yes, just stick them in ludo/cores directory.

We need to find a way to always pull an exact version of these cores.

Radius made a libretro-meta repo with some of these goals. We should really consider tagging releases of cores to help the situation. Running nightly all the time can be problematic.

[kivutar]

That's not bad. On my side, I've tried setting up travis+github releases on cores. See my PR in the snes9x repo.

It works well most of the time.

We just need to convince the libretro team to use it.

[kivutar]

This should already check that the core was downloaded #142