Topic themes (#2187)

* Bringing over in-progress changes from topic-core-css

- Adds _espresso-constants.scss;
- Cleanup colors and naming;
- Remove conflict res leftover 'domainObject' in mct-tree.vue;
- Still WIP!

* Various

- Remove pushBack / pullForward functions;
- Fix c-input-inline, remove bg until hover;
- TODO: input bg colors
- Increased margin in main-pane;

* Themeing WIP

- Conductor markup: convert to buttons for accessibility;
- Conductor styles consolidated and changed for better theme support;

* Themeing WIP; significant rewrite of pane headers

- Pane headers restructured for better semantics and clarity;
- Espresso design refined and tightened;
- Grid Vue changes for better themeing support;
- TODO: fix mobile version, collapse icon is whack;

* Restored Number-type input styling for correct positioning of spinner
button;

* Themeing mods for click-icon styles

* Bring Snow theme into style parity with Espresso

- TODO: refine Snow colors;

* Mobile styling fixed

- Mobile menu icon significant fixes;
- Hover only applied to desktop;
- Reorg of mixins;

* Bring Snow theme constants into parity with Espresso

- Refined Snow styles;
- Fixed missing scroll and padding in tree;
- Pane collapse button now uses proper color;
- Item Grid view refinement;
- Cleaned up code;

* Color fixes

- Super-menu description;
- Conductor time buttons hover;
- Datepicker "in-month" items color;
- Espresso colorKeyFilter brightened;

src/plugins/notebook/res/templates/entry.html

@@ -8,8 +8,7 @@
             <span>{{formatTime(entry.createdOn, 'HH:mm:ss')}}</span>
         </div>
         <div class="c-ne__content">
-            <!-- TODO: fix styling for c-input-inline when SCSS is merged and remove s-input-inline class here -->
-            <div class="c-ne__text c-input-inline s-input-inline"
+            <div class="c-ne__text c-input-inline"
                  contenteditable="true"
                  ref="contenteditable"
                  v-on:blur="textBlur($event, entry.id)"