Usbd MSC windows minimum scsi implementation

[alexrayne]

here provided MSC scsi <ReadFormatCapacity>, <Inquiry Serial> commands that denamded by win8

also introduced API that allow overriding by user code.

this branch also includes USBD logging refactorings to USBD_LOGXXX macros, vs old simple LOGXXX.

also level of log verbosity defined by value of USBD_DEBUG. levels system and loging sections are declared in usbd_private.h

[kuldeepdhaka]

Note to myself:

• Need to look into the MSC new code. (what it does and is it implementing correctly)
• the logging code is being push with MSC code, make them two different PR because they are decoupled & im still not sure if we are going in right directly for logging API.