Deprecate and eventually delete non-libseat launchers
!589 (merged) added libseat based launcher. It was agreed that, given some conditions, this should allow us to drop all the other launchers.
Have at last one stable release with libseat launcher used by default in the build configuration.
Announce the deprecation of the other launchers (e.g. in release notes).
OpenEmbedded has a recipe for libseat.
CI tests migrated from launcher-direct to libseat. (!594 (merged))
Documentation on how to use libseat with Weston. (!595 (merged))
Then, remove all the other launchers, and drop the launcher abstraction.
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