Merge #1611

1611: Initial state capture for closures r=philberty a=philberty

This patch set adds the initial support closure captures, move semantics are not
handled here. We track what variables are being captured by a closure during
name resolution so that when a VAR_DECL is resolved, we check if we are inside
a closure context node_id which is the same id as its associated rib id. So when
we resolve a name that resides in an outermost rib we can add this to set of 
node-id's that are captured by this closure.

There is a gap here for the case where we need to check if it is inside a nested
function and that function contains closures which could wrongly capture variables
in the enclosing function. This will also be a problem for nested functions in general.

Fixes #195

Co-authored-by: Philip Herron <philip.herron@embecosm.com>

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