General File Cleanup.
Panels liposuction of old D7 code.
Remove depricated d7 code from 8.x version of panels.
Add layout icons for core layouts.
Add requirements for 8.3 and a layout mapping for new layouts in layout discovery.
Issue #2699085 by tim.plunkett: Lock Panels IPE when a user has made TempStore changes.
Update ctools dependency version.
Issue #2839992 by samuel.mortenson, stmh: Remove hard-coded "Custom" category from AppView.js
Issue #2847503 by samuel.mortenson, DamienMcKenna: Panels IPE won't animate the "Toggle Preview" effect if additional form classes are added by a theme
Issue #2858557 by tim.plunkett: Remove test dependency on Panelizer
Issue #2858212 by tim.plunkett: Update PanelsIPELayoutForm to work with core 8.3.0
Issue #2821226 by tim.plunkett, japerry: Update Panels for layout_plugin in core.
Issue #2842779 by ccjjmartin, mishac: Update composer json for packages.drupal.org
Issue #2767087 by hideaway, samuel.mortenson: Re-index IPE blocks after invoking the alter hook.
Various Code cleanup.
Issue #2785287 by samuel.mortenson: Panels IPE's nested form removal method is not robust
Issue #2767087 by DamienMcKenna, samuel.mortenson, floretan: Provide hook to alter available blocks for IPE
Issue #2850782 by vijaycs85: Multilingual support for Panels IPE
Issue #2832876 by abu-zakham: Need RTL completely support for right to left language like Arabic, Farsi, etc
Issue #2709521 by samuel.mortenson: Cannot add site branding to panels variant
Issue #2687483 by phjou, doostinharrell, dobrzyns: Cannot switch variant layout
Issue #2848146 by beloglazov91: Fix problems related with clearing cache for IPE mini panel
Issue #978768 by mgifford, linclark, WorldFallz, alamp, boabjohn: PHP Notice when using Panel Fields
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