[#70] Show children for address with entrypoint in variables panel

Description

Problem: In some situation, where there is address with its entrypoint in the stack, it is a bit hard to notice (For example: tz1abcabcabc12314abc%foo).

Solution: When there is an address with entrypoint in the variables panel, it can be click to show the children which separates the address from the entrypoint.

Related issue(s)

Resolves #70 (closed)

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