Standalone profiling agent #480
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Adds a standalone profiling agent for spark.
This allows spark to be used to profile any Java application, not just Minecraft servers, clients and proxies. Of course, spark will continue to cater mainly towards Minecraft, but for example this could be useful for profiling an otherwise unmodified Vanilla server or client.
spark is loaded as a normal-ish Java agent and runs in the background whilst the main jar starts as normal. Example below is using an unmodified vanilla Minecraft server.
Instead of taking over the process stdin/stdout, spark runs a minimal SSH server, which the administrator can connect to in order to control spark and run commands.