Version 1.0.6

- Added SMBus host simulator registered as serial port.
- Added SMBus read/write utility program.
- Added kernel-mode SMBus test device simulator.
- Fixed a bug in CSF core library which would cause crash if link is
deleted while port is still attached.
- Modified CSF core library to initialize link and port collections if
they are not initialized when link or port is being created. This change
would solve an issue of causing crash on Windows kernel-mode when SMBus
test device simulator is initialized.