Add shorthand options for annotations

[pkedy]

Currently, annotations follow this syntax in order to support multi-valued annotations:

@myannotation(value1: "one", value2: "two")

For cases when 1 or no value is applicable for an annotation, it would be ideal to use a shorthand form to improve readability.

Single value - likely the most common usage

@myannotation("myvalue")

Is equivalent to

@myannotation(value: "myvalue")

No value - useful for "has annotation" style checks

@myannotation

Is equivalent to

@myannotation()