gstreamer-meson.eclass: New eclass required for gstreamer-1.18.0+

Gstreamer switched to meson in 1.16.0 and removed autotools support in 1.18.0,
this eclass is an update of gstreamer.eclass.

One significant change is that we lost the gstreamer_system_link function.

Differences from version 1:
- Move to EAPI-7, including moving deps from DEPEND to BDEPEND when appropriate
- Port python script to perl, this allows to avoid having to add PYTHON_COMPAT
  into a python-unrelated eclass
- Drop errorneous MULTILIB_USEDEP on virtual/pkgconfig
- Fix running tests: defining multilib_src_test, media-libs/gstreamer[test] dep
- Fix ebuild emesonargs being ignored
- Remove legacy prune_libtool_files
- virtualx wrapped for testing

Differences from version 2:
- Get list of plugins from meson_options.txt instead of hard-coding them,
  this adds GST_PLUGINS_NOAUTO for ones managed by the ebuild
- Fix @AUTHOR order
- Sort inherits
- remove stray semicolon in test
- Add virtx to tests
- Remove gstreamer_environment_reset
- Put GST_ORG_MODULE conditions into gstreamer_multilib_src_{compile,install}
- QA warn when IUSE=orc is defined but the option is absent
- Pass gst_debug/examples/nls/tests options only when declared
- Use code similar to orc for introspection

Closes: https://bugs.gentoo.org/690468
Signed-off-by: Haelwenn (lanodan) Monnier <contact@hacktivis.me>
Signed-off-by: Sam James <sam@gentoo.org>

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