Option to fully validate variables

[nblumhardt]

Once, using an undefined variable like #{Fooo} would cause an error. On moving to 2.0, since we now use partially-evaluated variables in many more places, this is no longer an error - which for users is less convenient than the old fail-fast approach was: http://help.octopusdeploy.com/discussions/questions/2077-variables-in-the-process-that-dont-exist-in-the-scope

The root issue here is that the original variable evaluator works on a set at a time.

Variable evaluation should be completely lazy/dynamic, so that undefined variables are fine so long as they're not used, but if used they throw.

[PaulStovell]

Closing this - agree we should do it when we do #778 (no need to keep both items open)

[nblumhardt]

Reopening so that we can make these changes in a fine-grained way rather than via one huge ticket.

[lock]

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