[Layout] Add view large button for zooming

Fixes #1437
Markup and CSS for `view large` button in frame context;
Sass formatting cleanups; removed unused styles from
_layout.scss; mods to MCTTriggerModal.js to remove
button label functionality;

Added new "icon-expand" glyph and class;

Fixes #1437
Fixes #1423
New overlay > l-dialog and l-large-view classes;
Fix context-menu z-index to allow context menu
to appear in the overlay;
.object-top-bar refactored and replaced with
.object-browse-bar;
frame > hover now only displays local controls for
proper level, handles nested layout situation;
Fixed font-weight display issues;
MCTTriggerModal.js modified to do the following:
- Remove .frame classes when displaying object in overlay
- Allow click on this overlay .blocker to dismiss overlay

Fixed min-width issue incorrectly targeting .object-browse-bar in frame context;

Added expand anim to large view holder;
Changed close button icon

Significant mobile styling and cleanups;
Markup mods for overlay.html;
Handles dialog on top of large view;
Form validation now displays better in mobile;
Updated /src/api/ui/dialog.html to be in-line
with /platform/commonUI/dialog/res/templates/overlay.html;
Moved border-radius from containerBase to btnBase mixins;

Animate with scale for GPU acceleration

Change desktop animation to use scale, so that it is hardware
accelerated and buttery smooth.  Also fixes text anti-aliasing
to improve readability.

Moved mobile/overlay/_overlay.scss styles into
overlay/_overlay.scss; removed mobile/overlay/_overlay.scss;
Cleanups in _overlay.scss; restored max-width/max-height
to dialogs (removed in #1376 for #1298) and added
min-width;

[Frontend] Mobile fixes in overlay and related

Fixes #1437
Added mobile-specific styling to _messages.scss;
Fixed button layout and margins in _overlay.scss;
Fixed message.html to not default to major style
buttons;

[Frontend] Timing tweaks

Fixes #1437
Moved large view expand transition duration
into theme _constants files; shortened anim
duration

Fix Style errors

[mctTriggerModal] correct scope for toggle

Correct scope for toggleFunction such that #1503 no longer occurs.

Fixes #1503

[Style] Add copyright header

platform/commonUI/themes/espresso/res/sass/_constants.scss

@@ -17,6 +17,7 @@ $hoverRatioPercent: 10%;
 $basicCr: 3px;
 $controlCr: 2px;
 $smallCr: 2px;
+$overlayCr: 11px;
 
 // Buttons and Controls
 $colorBtnBg: pullForward($colorBodyBg, $contrastRatioPercent);
@@ -146,6 +147,7 @@ $colorOvrFg: pullForward($colorBodyFg, 30%);
 $colorOvrBtnBg: pullForward($colorOvrBg, 20%);
 $colorOvrBtnFg: #fff;
 $colorFieldHintOverlay: pullForward($colorOvrBg, 30%);
+$durLargeViewExpand: 250ms;
 
 // Items
 $colorItemBg: lighten($colorBodyBg, 5%);