Also fall back to caching to memory if SQLite can't be linked.
This is a common issue with (bad) server hosts who mount /tmp as noexec,
which causes sqlite's native binaries to fail to link.
Fixes a few issues such as /wg stopprofile leaving a pseudo-cancelled
task in the supervisor, delaying server shutdowns until profiles finish,
not forwarding exceptions that occur during tasks running correctly, etc.
Old Bukkit code can still be found in the worldguard-legacy folder
and built with `gradle worldguard-legacy:build`. Hopefully nothing
got lost in the gradle-ization.
