Send ConEvHighlightValue notifications the mouse moves over or leaves a value/dereference in the graph viewer.
Send a ConEvHighlightDecl when the mouse moves over or leaves a function node in the graph viewer.
Bump the stack reserved for SeeC to 100KiB.
Highlight active Decls when no active Stmt is available (this may be useful when a Decl causes a runtime error, i.e. stack overflow).
Detect mouseover of locals and parameters in the graph viewer, and send a ConEvHighlightDecl for their Decl.