Visual Test Shell for BACnet SVN

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Added the don't care operator (?=) into all of the primitive Match functions.
Added checks in all of the Expect methods to handle cases for ? in place of data.

Added IsDontCare() method to ScriptToken. Altered Next() in ScriptToken
to scan for ?= don't care operator or a simple ? in place of an identifier or data
token. This is set to ScriptValue and feeds into the IsDontCare() method.

Added PreMatch method to BACnetEncodeable. All virtual Match methods
call PreMatch for special case. Just so happens the only special case thus
far is for the ?= don't care operator.

Added ?= operator to syntax check.

Added virtuals for assessing the proper data type of each encodeable type
and a clone method.

Added types for super types like PriorityValue and CalendarEntry.

Modified propery lookup to use specified index for arrays. Retunred value from
BACnetAnyValue is now a type of the element.

Modified ScriptToken to support indices. Added new m_nIndex value and other string
values for index creation. ScriptTokens now support a chain of other script tokens that
represent an index (as yet unresolved) into the current script token's value.

Added method to resolve index into script token. Also, the parsing function has been
altered to allow for index specification [].