### Add non-deterministic expressions with side-effects.

The following things have been changed in this revision: * We now give a small step semantics for expressions. The denotational semantics only works for side-effect free expressions. * Dynamically allocated memory through alloc and free is now supported. * The following expressions are added: assignment, function call, unary operators, conditional, alloc, and free. * Some customary induction schemes for expressions are proven. * The axiomatic semantics (and its interpretation) have been changed in order to deal with non-deterministic expressions. * We have added inversion schemes based on small inversions for the operational semantics. Inversions using these schemes are much faster. * We improved the statement preservation proof of the operational semantics. * We now use a variant of SsReflect's [by] and [done], instead of Coq's [now] and [easy]. The [done] tactic is much faster as it does not perform inversions. * Add theory, definitions and notations on vectors. * Separate theory on contexts. * Change [Arguments] declarations to ensure better unfolding.

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