Constructors, interfaces, `this` scope, getters and virtual modifiers

[ggiraldez]

This PR adds support for several new areas:

• Contract constructors are now properly connected to the contract lexical scope
• Calling a contract constructor using named parameters
• this provides a scope with access to the current contracts functions
• State variables declared public are exposed as external functions
• Improve function modifiers by allowing and correctly resolving inherited and virtual ones
• Support interface inheritance

[changeset-bot[bot]]

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Latest commit: 5361a4b2273a4034e31e6c156fb559d29a9527f7

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