Business Layer; new functions to create GUIDs added to ISTextUtilities

New functions to create GUIDs have been added to ISTextUtilities, i.e. finBL.Runtime.TextUtilities.

Although it is easy enough to create GUID in scripts, simply use Guid.NewGuid().ToString(), these functions provide useful alternatives.

A GUID is an acronym for "Globally Unique Identifier" and is a 128-bit integer number used to identify resources.

===GetGuid===
Returns a new 36 character GUID.

E.g. b85f8f6a-5d3e-4162-94fc-9534239d90a4

===GetGuidShort===
Returns a new 22 character GUID. Note, this is as unique as GetGuid, it simply encodes the text string differently.

E.g. GbzwwqSAGk-b9p2btXGqlQ