Notes on user feedback:

• Fix packet counter, it currently wrongly assumes that the caller initializes it with a starting value, use an internal incrementing counter per pad and only update it when the report has changed
• Fix performance issues due to errors in the state machine
  • SCP Xinput Bridge DLL causing huge performance drop after a couple of minutes #214
  • SCP Xinput Bridge DLL consuming a lot of CPU while playing games on Pcsx2 emulator #225
  • A few issues when combining DualShock 3, DsHidMini and PCSX2 (the new Qt builds). #227
• Fix incomplete XInputGetCapabilities implementation
• Allow pass-through for real XInput-compatible pads
  • Currently only DS3s in SXS mode get detected and reported as connected
  • Listen to native XI APIs and pass-through any other XI pad if there is free slots
  • If no DS3s are present, the DLL can basically act as a transparent proxy for any XI pads so the user doesn't need to swap/rename DLLs when switching controller models
• Rework device detection logic
  • Enumerate both DS3 and X360 device once on startup
  • Keep track of device arrival and removal with CM_Register_Notification to simplify the current state tracking logic