Fix incorrect behavior when channels are requested non-sequentially

[praashie]

WineASIO has had a long-standing bug when the host application does not use all channels sequentially.
After these changes, WineASIO will connect and activate channels based on buffer_info->channelNum instead of assigning them sequentially.

WineASIO channel	Active	What is actually connected	Correct behavior
in_1	-	-	-
in_2	X	in_1	in_2
in_3	-	-	-
in_4	X	in_2	in_4
out_1	X	out_1	out_1
out_2	X	out_2	out_2
out_3	-	-	-
out_4	X	out_3	out_4