Fix indents in MED4 loader

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Process MED synth waveform command CHD

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Fix mishandling of MED4 effect FFD

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Update chagelog

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>