Add click functionality

[n3wtron]

Added click functionality. Created 2 functions: now the component accepts 1 new input parameter isSegmentClickable and emits a new signal segmentClicked. The first one is an input function that returns a boolean

function isClickable(segment:NgxJsonSegment):boolean

the signal can be used to handle the click event

function segmentClickHandler(segment:NgxJsonSegment)