[fix] api js: instanciate a FmlItem() object for each to-parse xml source
[ui] story item: dynamically compute item height based on story text height
[ui] comment item: default avatar image
[ui] comment item: item height is based on max(avatar's height, comment's height)
[feat] dynamically load comments from selected story
[fix] Comments{} component is declared statically in VDM ApplicationWindow in order to have access to api variable
[ui] comments list: top positioning (not overriding PageStack dots)