Fix shrink wrap not applying correctly

[tneotia]

Fixes #290
Possibly fixes #297? Don't quite know what that issue is wanting.

This by itself does not fix the entire issue if the HTML would extend past the page width in the first place. For this to work without fail, people will have to do

Row(
   children: [
	Expanded(
	   child: Html(//params)
	),
	//whatever other widgets
   ]
)

However there is no longer an error when using the widget inside a Row().

@ryan-berger just a note for you, (if this will be merged) please merge this before #507 so I can also apply the renderContext attributes to the code I am using in that PR, then that will be ready to be merged as well.

[tneotia]

@ryan-berger could you check this one out? #507 is ready as per @erickok , I would like this to be merged beforehand so I can apply the same fixes to the widget rendering code in that PR.

[ryan-berger]

Almost there, just some simplifications and questions to answer

[tneotia]

@ryan-berger I've made the changes, let me know if there's anything else.

[ryan-berger]

Couple small things

[tneotia]

@ryan-berger cleaned that up too. Forgive me, I know these are better ways of styling code but sometimes I get back into that same rut of bad habits when I'm not paying close attention. I'll try to pay more attention from here on out, but bear with me in case I do make these errors every now and then.

[ryan-berger]

@tneotia No problem! I'm definitely not frustrated or mad, just trying to enforce concise code where possible.