Skins2: Use typedefs for internal template-derived types, and rectify an accidental skip while removing.

Add a GetColumnSize function in the SQL API.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

DirectSound spdif-mode audio output was garbled because buffer calculations
were using always pcm-mode size values.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

This stupid library with only 1 file to compile has won, by far, to be awarded the MOST STUPID config/Makefile system... Seriously, autotools is bad, but if you do stuff like that, please go and stop using a computer