R&I Misc UI 3 (#2253)

* Limits-related changes; WIP

- Renamed CSS classes: `s-limit-*` > `is-limit--*`;
- Removed load of legacy _status.scss and added new _status.scss file;
- Minor re-org of limit/status constants in theme files;
- Limit colors in theme constants all updated;

* Fixes for s-selected always displaying the move cursor

- Mod s-selected;
- Reinstitute `.is-moveable` class;

* Layout-related cleanup and refinements

- LineView cleaned up;
- Selection, hover, etc. classes for c-frame cleaned up;
- Constant names normalized, theme files updated;

* Fixes for editing plot options

- Color palette now more flexible;
- Styles for color palette button refined;
- c-input--flex added for more flexible inputs;

* Various swatch-related changes

- Swatch refinements, new .c-click-swatch class;
- Added .c-click-icon--major modifier style, applied in markup;

* Local controls class application and behavior cleanup

- Remmoved .has-local-controls from selected markup;
- Refined CSS selector for better hover behavior;

* Misc UI tweaks

- click-icon--major in Notebook;
- .test mixin improved;

* Update _constants-espresso.scss

* Update _constants-maelstrom.scss

src/plugins/plot/res/templates/plot-options-browse.html

@@ -70,17 +70,9 @@
                     <div class="grid-cell label"
                          title="The plot line and marker color for this series.">Color</div>
                     <div class="grid-cell value">
-                        <!-- TODO: get this into a class -->
-                         <span class="color-swatch"
+                         <span class="c-color-swatch"
                                   ng-style="{
-                                  'background': series.get('color').asHexString(),
-                                  'display': 'inline-block',
-                                  'border': '1px solid rgba(255, 255, 255, 0.2)',
-                                  'height': '10px',
-                                  'width': '10px',
-                                  'vertical-align': 'middle',
-                                  'margin-left': '3px',
-                                  'margin-top': -'2px'
+                                  'background': series.get('color').asHexString()
                                }">
                          </span>
                     </div>