Handle exception from getEmbeddedPlugins gracefully

Currently `StoicConfig.getEmbeddedPlugins` is called prior to setting up stdin/stdout/stderr. So if it throws, we can't show the exception in stderr. You can still see it in logcat, but it would be better to have it in stderr.

Trace the startup path around StoicConfig.getEmbeddedPlugins and the setup of stdin, stdout, and stderr. Reproduce an exception from getEmbeddedPlugins and compare the current logcat behavior with the desired result. Done means the exception is also shown through stderr when plugin setup fails.

Written by the indexing model from the issue text.