Replacing GLUT with SDL2 as the default application toolkit about magnum HOT 5 CLOSED

I agree with this, support for glut should be dropped after LTS 14.04, but SDL2 example bootstraps should be added into the mix. It took me to long to figure out how to have cmake find SDL2 on osx.

I believe another github user recommended that FindSDL2.cmake should be merged into each of the bootstrap branches.

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The need for FindSDL2.cmake is mentioned in Platform::Sdl2Application class documentation and I can't do much more about that.

I don't want to add the FindSDL2.cmake file into all GLUT bootstrap projects, as the bootstrap repository should contain only the essential files and not anything that might be needed only in some cases.

Okay, I'll add at least base-sdl2 bootstrap project (which will be then merged back to base one after the switch). Hopefully the users will then be able to make similar change in other bootstrap projects as well.

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I added base application using SDL2 to base-sdl2 branch in mosra/magnum-bootstrap@e7206b6. The difference from base branch is explained in README, so the users should be able to make the change also in other bootstrap projects.

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Ubuntu 14.04 was released on April 17th, so unless someone has serious objections against the switch, I'll slowly start replacing GLUT with SDL2 everywhere. The "old" Platform::GlutApplication will remain in the repository, but everything else (documentation, tutorials, examples, bootstrap code) will now use Platform::Sdl2Application.

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Done in 8a412f1, mosra/magnum-examples@a4b3b8d and also in all branches of magnum-bootstrap repository. The bootstrap repository now contains also base-glut branch where SDL2 is replaced by GLUT for compatibility purposes.

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