Added CPack definitions and an NSIS template for easy packaging

[MarioLiebisch]

This change allows simple packaging using CPack, i.e. cpack . in your build directory. This will use a default packager based on the operating system and environment.

It's also possible to pick specific packagers/generators to create compressed archives or packages (e.g. cpack -G ZIP . to create a ZIP archive).

If the Nullsoft Scriptable Install System ist available, cpack -G NSIS . may be used to create a wizard style installer for Windows:

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The "compiler identification" for the path and "Add/Remove Programs" entries (Windows) still need some better solution to not only show "GNU" or "MSVC".

_Any suggestions?_

[eXpl0it3r]

Are BMPs the only supported format?

[binary1248]

I use NSIS (with CPack) at work. From what I can tell, it uses BMPs because that is the only format for which there is native win32 support.

[MarioLiebisch]

Yep, as far as I know the original assets (WinAPI resources) in the setup program are just replaced with these. I could try using some compressed/smaller format (palettized or RLE), but not sure it's worth it?

[binary1248]

Those images aren't meant to be that big anyway. Compared to the rest of the contents they normally don't make up a noticeable amount of the total size.

[MarioLiebisch]

Just tried it. 8 bit works fine. Down to 60 KB for both images. Could of course just skip these, was more like a "if we're going that far…" addition. :)

[eXpl0it3r]

This is outdated.

I'm not sure I really see the use-case for this. When exactly do you want an installer just to install some SFML DLLs?

[binary1248]

In a perfect world, the installer would also make sure you don't have to do anything else to get SFML up and running on your development machine. This includes adding the necessary templates to IDEs, setting up environment variables, adding shortcuts to e.g. the examples directory, being able to easily reverse the changes i.e. uninstall whatever version you installed.

It would be a nice addition, not necessarily essential, and considering that more and more package managers are becoming available maybe at some point no longer relevant, but none the less still a stop-gap solution for now.

[eXpl0it3r]

Resolved merge commit and rebased onto master.

This PR adds:

• Add CPack support
• Add additional configurations for NSIS

While I believe NSIS isn't necessarily needed, CPack support might be quite useful and might be integrated/utilized in CI setups.