Added MCommandExtensionsV1 as an extensible way of adding new virtual functions to CCommandBase without breaking BC. Using this, added a custom error code resolver and added lots of Software Install errors to swi.

X one
X twoX threeX four
X five
X six
X seven…X eight
X nine
X ten

Before 111
Before 222
Before 333…Match
After 111
After 222
After 333
And so on and so on
And so on and so on