Visual Test Shell for BACnet SVN

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 [].

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This problem was caused during an attempt to reallocate an APDU buffer
to accomodate a larger size (all those property requests fill up quickly).
The allocation for the proper new buffer size was backwards
(using <= instead of >).
This has been fixed in the CheckSpace method of BACnetAPDUEncoder.

There may still be a problem with a rpm request that must be segmented.
This can be verified by testing this MAX script on a device that supports
segmentation.