feature(keyringctl): support query expressions for packet field selection

Levente Polyakrequested to merge
fix/packet-query-expr into master

Instead of simply string matching a line, we now traverse the packet as a tree and match the path based on a depth first search.

While traversing, we support logical OR and current depth * wildcard processed as a component based query expression.

Callee's are adjusted to specifically select the appropriate Issuer at the correct depth.

Fixes #185 (closed)

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