If you stop/start the GUI but it doesn't exit on start, the second
--start (when lokinet is already running) waits for a state change that
doesn't come (because lokinet is already running). This add a check for
already-running so that we exit right away in such a case.
CMake apparently doesn't do anything with CMAKE_OSX_DEPLOYMENT_TARGET
for swift, which results in a 12+ minimum version. This fixes it
(albeit in a hacky way since the only apple-sanctioned way to properly
set this appears to be "use xcode").
Shame on Apple, as usual.
Adds support for building Lokinet as a system extension, and fixes
various problems in the macos implementation found during development of
the system extension support.
