Add SELinux Kernel Policy Language and Common Intermediate Language

[qwandor]

Description

This PR adds both the SELinux Kernel Policy Language and Common Intermediate Language. I've put them in the same PR because they are often used together, and the grammars come from the same repository.

Checklist:

• I am adding a new language.
  • The extension of the new language is used in hundreds of repositories on GitHub.com.
    • Search results for each extension:
      • https://github.com/search?utf8=%E2%9C%93&type=Code&ref=searchresults&q=extension%3Ate+NOT+nothack
      • https://github.com/search?utf8=%E2%9C%93&type=Code&ref=searchresults&q=extension%3Acil+NOT+nothack
  • I have included a real-world usage sample for all extensions added in this PR:
    • Sample source(s):
      • https://github.com/pacoon/guix/blob/a5e72222e48c27c501abedf83ac26a2f37b90574/etc/guix-daemon.cil
      • https://github.com/spidermana/selinux-policy-myfork/blob/efc8fe9a5aad08057fe1523541cb17bddf701ebc/src/file/certfile.cil
      • https://cs.android.com/android/platform/superproject/+/master:system/sepolicy/private/genfs_contexts (trimmed down a bit)
      • https://cs.android.com/android/platform/superproject/+/master:system/sepolicy/private/initial_sids
      • https://cs.android.com/android/platform/superproject/+/master:system/sepolicy/private/security_classes
      • https://cs.android.com/android/platform/superproject/+/master:system/sepolicy/public/fsck.te
    • Sample license(s): GPLv3, Unlicense, public domain
  • I have included a syntax highlighting grammar:
    • https://github-lightshow.herokuapp.com/?utf8=%E2%9C%93&scope=from-url&grammar_format=auto&grammar_url=https%3A%2F%2Fraw.githubusercontent.com%2Fgoogle%2Fselinux-policy-languages%2Fmain%2Fsyntaxes%2Fcil.tmLanguage.json&grammar_text=&code_source=from-url&code_url=https%3A%2F%2Fraw.githubusercontent.com%2Fpacoon%2Fguix%2Fa5e72222e48c27c501abedf83ac26a2f37b90574%2Fetc%2Fguix-daemon.cil&code=
    • https://github-lightshow.herokuapp.com/?utf8=%E2%9C%93&scope=from-url&grammar_format=auto&grammar_url=https%3A%2F%2Fraw.githubusercontent.com%2Fgoogle%2Fselinux-policy-languages%2Fmain%2Fsyntaxes%2Fsepolicy.tmLanguage.json&grammar_text=&code_source=from-url&code_url=https%3A%2F%2Fraw.githubusercontent.com%2FProject-Proton%2Fandroid_system_sepolicy%2Ff0af6f3338b216b5346800766a6f01a53d5f2ea3%2Fprebuilts%2Fapi%2F26.0%2Fpublic%2Ffsck_untrusted.te&code=
  • I have updated the heuristics to distinguish my language from others using the same extension.

[lildude]

LGTM. Thanks.

You've just missed the last release so GitHub.com won't gain support until the next release is made which will be in about a month's time.