Revised MSC initialization

Wait for SW2 to start MSC
Show opening message
Enable MSC_OUT endpoint
Declare MSC statemachine

Define state typr MscState and variable.
Initialize state at mscInit
Implemented CBW WAIT state

Added CBW_WAIT  to state machine
Added mscCbwWait() to get CBW
Added mscShowCbw() to show CBW
Declare CBW Length as global

Declare variable mscCbwLength
Revised to use the global variable
Implemented SCSI commands

Implemented REQUEST_SENSE, INQUIRY, READ CAPACITY (10)
Added some functions to reentrant list