run.dlang.io/ add scrolling window and possibly src line mapping

[IntegratedDimensions]

Large code is produced for assmly and others and it would be nice 
if it had it's own window to scroll rather than scrolling the 
entire window.

Also it would be nice if clicking on a line in the src scrolled 
to the proper location in the output

It would also be nice if the imports were removed or hiddable 
from the source.

Probably would be easier to read if also the source code lines 
that generate the assembly were inserted in the code where they 
are disassembled.