Add support for collections

[mfulton26]

I'd like to be able to use parameters that are lists or sets.

Today I can do something like the following:

PLATFORM:   x86, ia64, amd64
CPUS:       Single, Dual, Quad
RAM:        128MB, 1GB, 4GB, 64GB
HDD:        SCSI, IDE
OS:         NT4, Win2K, WinXP, Win2K3
IE:         4.0, 5.0, 5.5, 6.0
APPS_size:  0, 1, 2
APPS_0:     n/a, SQLServer, Exchange, Office
APPS_1:     n/a, SQLServer, Exchange, Office

IF [APPS_size] = 0 THEN [APPS_0] = "n/a" AND [APPS_1] = "n/a";
IF [APPS_size] = 1 THEN [APPS_0] <> "n/a" AND [APPS_1] = "n/a";
IF [APPS_size] = 2 THEN [APPS_0] <> "n/a" AND [APPS_1] <> "n/a" AND [APPS_0] <> [APPS_1];

I'd like to be able to write something more succinct though. e.g.:

PLATFORM:   x86, ia64, amd64
CPUS:       Single, Dual, Quad
RAM:        128MB, 1GB, 4GB, 64GB
HDD:        SCSI, IDE
OS:         NT4, Win2K, WinXP, Win2K3
IE:         4.0, 5.0, 5.5, 6.0
APPS (Set): 0..2 of { SQLServer, Exchange, Office }

For a list the above example would not have [APPS_0] <> [APPS_1] and would have APPS (List) instead of APPS (Set) (or some similar grammar).

[jaccz]

Here's a nuance of the code that doesn't quite have the same meaning but gets you very close:
https://github.com/Microsoft/pict/blob/master/cli/mparser.cpp#L172

What this means is that you can write things like:

APPS_0:     n/a, SQLServer, Exchange, Office
APPS_1:     <APPS_0>

or even

APPS_0:     n/a, SQLServer, Exchange, Office
APPS_1:     <APPS_0>, AnotherValue, OneMoreValue

Adding more complexity on top of this doesn't seem worth it.