Significant changes

• Fix a bug where FlexASIO waits until the worst possible time to provide the next output buffer, increasing output latency by one buffer length. See #40.
• Added support for ASIOOutputReady(), enabling compatible ASIO Host Applications to achieve a one buffer length reduction in output latency. See #4.
• Speed up the beginning of streaming by providing initial buffers to PortAudio (instead of silence). See #40.
• Fix a bug where FlexASIO underestimates output latency by one buffer length. See #40.
• Fix a bug where FlexASIO provides slightly wrong ASIO timestamp information to the Host Application. See #40.
• Change the directProcess ASIO flag from false to true in buffer switch callbacks. This can potentially improve performance with some ASIO Host Applications. See #40.
• Various performance improvements that provide more time budget for processing events, making audio glitches (discontinuities) from missed deadlines less likely, especially with small buffer sizes.

Minor changes

• Many improvements to the FlexASIOTest test program:
  • Add the --input-channels and --output-channels options.
  • Preload the input file before streaming, and write the output file after streaming, to avoid performance issues caused by sound file I/O.
  • Add a --log-mode option to customize the way the log is output.
  • FlexASIOTest.exe has been refactored into a small wrapper around a DLL containing the testing logic, ASIOTest.dll.
  • Fill the first buffer before calling ASIOStart() instead of waiting until the first buffer switch.
  • Optionally call ASIOOutputReady() when an output buffer is filled.
  • Add --buffer-switch-delay-ms option for adding an artificial delay to buffer switch callbacks.
  • Exit cleanly when receiving a CTRL+C signal during streaming.
  • Call ASIOStop() even when streaming failed.
  • Do not wait for a buffer switch if --buffer-switch-count is zero.
• Ship PDB files in the installer (again) to allow troubleshooting tools (Process Explorer, Process Monitor, Windows Performance Analyzer, WinDbg, etc.) to understand FlexASIO stacks.