This also fixes an issue where MIDI CI header data could contain spaces,
which is not allowed according to the spec.

This change affects the DatagramSocket and StreamingSocket classes.

- Also refactored internals to use weak/shared pointers

This allows defining JUCE_LOG_CURRENT_ASSERTION when using Visual
Studio, where escaping semicolons in the command-line is not possible.

This allows real-time threads to join an audio workgroup on Apple platforms.

Status codes are already filtered in curlHeaderCallback, so there's no
need to remove them again in parseHttpHeaders. Request headers will
never include a status, so there's no need to remove the status in that
case.