Apply styles from #11577
Re-style buttons, add  var, re-style bottm/pagination toolbar
Outsource secondary button styles to new component _secondary-button.scss
Start to outsource toolbar styles into _toolbars.scss
Re-style split button (pkgmgr) and grid action buttons
Re-styled actionbar buttons, nuked all separators, add consistent ids + primary class
Nuke more separators, add consistent ids and classes + more UI work
Some media manager fixes
Fixed page size width in JS, added general .modx-code-content class + integrated feedback
Nuked hardcoded width for page size field, added a class + according styles in SCSS
More opacity for disabled items, tree trash modifications, searchfield not white
Re-style TV panel
Include fixes from #11605, preventing flash of unstyled TV forms on manager page load
Removing bottom border of TVs + same field spacing as default resource fields
Prevent panel collapse arrow button to overlap actionbar
Fix merge conflicts
Fix content elements like actionbar (newly introduced to higher z-index) and locked grid overlay (ex. element property tab) overlapping the top menu subnavs
Fix package browser download button
Fix cut off package browser search field
Pkg manager/browser fixes, tree adjustments, consistent box-shadow on all panels, re-enable grid editor