Logic Inspector: Simple IPC log parsing

Logic Inspector showing a series of IPC messages

Building on a previous quick hack to let :mcav's logic inspector UI understand mach mochitest --log-raw OUTPUTFILE TESTNAME logging, I've added another quick hack that runs a regexp against MOZ_IPC_MESSAGE_LOG=1 messages and extracts the content of the fields so that we colorize based on the PID that's the one sending or receiving the message.