Switch to using uniform function call syntax

[Rohansi]

Breaking change. A uniform function call syntax would implicitly compile code such as:

obj.something.method(1, 2)

into

const this = obj.something; // do not evaluate the left of the call two times
this.method(this, 1, 2); // inject 'this' value as the first argument

This would replace the current method of checking all field accesses in the runtime and, if returning a function, creating and returning a new closure with a bound 'this' value.