Allow qualified names for function calls, variable access, contract instantiation

[jeromesimeon]

At the moment, only type/new objects get parsed as (possibly) qualified names. All functions, contracts and constant should be resolved qualified names and imported.

• Functions
• Contracts
• Constants

[jeromesimeon]

In PR #466

$ ./bin/ergotop examples/helloworld/model.cto examples/helloworld/logic.ergo examples/promissory-note/money.ergo 
Welcome to ERGOTOP version 0.4.3
ergo$ set contract ~org.accordproject.helloworld.HelloWorld over ~org.accordproject.helloworld.TemplateModel{ name : "Fred Blogs" }
ergo$ return ~org.accordproject.ergo.money.compoundInterestMultiple(3.5, 100.0)
Response. 1.50994918677 : Double