Distribute libcif with Julia's artifacts system

[Guillawme]

Hello,

For systems that don't provide cifapi/libcif in their default package manager, it could be helpful to distribute it through Julia's artifacts system. Its license allows redistribution.

[jamesrhester]

libcif requires both unicode libraries and sqlite libraries, so it is not as lightweight as it looks. Note that CrystalInfoFramework should be fully functional without libcif and the speed difference is less than it used to be, so an alternative plan might be to remove libcif completely.

[Guillawme]

Ah, ok. I thought the difference was still relevant because using the native parser emits a warning. And I had not thought about the whole dependency chain, which indeed complicates things quite a bit.

[jamesrhester]

Should the native parser become the default, then there is no reason to emit a warning if it uses the Julia parser instead of the C parser.

[jamesrhester]

Commit e59b520 adds libcif support via cif_api_jll. It doesn't work for Windows, seems to be a problem with detecting end of file. Other platforms now do not need separate installation of cif_api.