Fixes#1047
<mct-form> must now include class
'validates' to display validation glyph icons;
removed 'no-validate' from markup; cleaned
up validation scss;
open #729
In-progress!
Markup and CSS mods continued;
Config params added to PlotOptionsForm.js to
allow control-first layout per form row;
Changed titles of Inspector parts;
open #729
In-progress!
Markup and CSS modified to cleanup control layout
and styling in Plot and Table config options;
gulpfile.js modified to include SASS source line numbers
in rendered CSS;