v1.4

• added 16-bit protected-mode variant vsbhda16.exe.
• reworked HDA initialization code
• Creative's diagnose.exe accepts vsbhda's SB emulation.
• fix: virtual DMA address may have been too high (crash in tyrian2k)
• fix: writes to virtual DMA channel ports C0h-DFh caused writes to
  ports 10-1Fh
• handle "Runtime Error 200" issue in vsbhda16.
• fix: DSP cmd 0x91 now handled correctly.
• fix: virtual DMA register reads of 08/D0 (status) corrected.
• removed stack checks for C++ sources.
• fix: mixer volume setting for HDA devices.
• cmdline option /BS added.
• direct DSP cmd 0x10 supported.