Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>

Refs #3175. Sorry for the huge commit but certain things require Matrix to be in Kernel. Given how Quat, V3D and Matrix inter cooperate it seemed sensible for them to be in the same place and arguably this is where they belong anyway.

Rename Framework code directory to just that. Also delete Main and VS & Eclipse project file. Re #1881.

Added a BoundingBox class and implemented caching at the CompAssembly level. Note that there are still several functions using the old getBoundingBox methods but this covers a lot of the needed code for the MC correction. Re #1212

Added subfolders to src and inc in Geometry.vcproj
Tested with scons and VS sln builds

          Fixed Plane bounding box

Added a ListValidator, which allows a (string type) property to be restricted to a set of values. Changed the "Target" property on ConvertUnits to use this. The Property class now has an allowedValues method which returns the set of allowed values if a ListValidator is attached to the property, or an empty set otherwise.
Also modifies the PropertyWithValue class so that it is no longer possible to set a property's value to an invalid value.
Re #150.