[MM-10586] Desktop App Window/Tabs Update (#1056)

* [MM-19054] Added new server tab look and feel, still missing proper hover states and session expired icon

* [MM-19055] Added window controls and removed border for macOS

* [MM-19055] Add dark mode for macOS

* [MM-19054] Added session expired icon

* Test windows titlebar

* Fixed the menu issue and added non-macOS dark mode

* Blank commit

* Fixed a lint issue

* Fixed more lint issues

* Fixed more issues

* New tray icons

* [MM-19603] Drag and drop tabs

* Fixed some assets and fixed build output to include missing assets

* Fixed a couple small issues

* Only show tabs for only 1 server on Mac

* Fixed some more tests

* Fixed another test

* Revert "Fixed another test"

This reverts commit 36040294a71a68663d06996d71eecc5ed23d7014.

* Fixed another test

* Trial and error!

* A bunch of additional fixes

* Fixed a lint issue

* Fixed restore focus on add server tab causing bad UX

* Trial and error on flaky test again

* Fixed some bugs based on PR feedback.

* blank commit to push tests

* Revert "Test windows titlebar"

This reverts commit 9cd46b71b1427b75942434ac49185870d2437b85.

* Remove the rest of the old new titlebar and fixes

* Added three-dot link

* New menu

* Rest of new windows menu and other fixes

* Fixed lint errors

* Added windows 10 style title bar buttons for non mac OS

* Lint fixes and enabled the tab bar regardless of number of servers

* Missed one

* Fixed unicode characters

* Commenting out test that should no longer be applicable

* Removed Windows 10 style titlebar icons and used material design instead

* Fixed a lint issue

* Some small UX fixes

* blank commit

* Fixed an issue where dropping the first tab moves it too far over before snapping into place

* Additional style fixes

* Another small issue fix

* Back to Windows 10 style

* Lint fixes

* Accessible three dot menu

* Lint fixes

* Shrinking tabs when window is too small

* Gradient between tabs and title bar buttons when window is too small

* Add drag to gradient

* Replaced icons, drag and drop cursor sticking fix, slight tab change

* Lint and some mac fixes

* Light theme fix to three dot menu

* Hack for tab sticking to cursor on macOS

* Fixes for the find utility

* Fix for Catalina dark mode

* Revert "Fix for Catalina dark mode"

This reverts commit 45da05dd0f17f46efd1c53fafb92e9c1fd9dd8d9.

* Fixed a couple issues Dean found

* More fixes

* Three dot hover effect to circle

* PR feedback

* Test fixes

* Test and config fixes

* Disable dragging when there are GPO servers

* [MM-20757] Fixed dark mode on debug when running macOS Catalina

* Allow future config versions to use v2 config if launching this version of the app

* Oops

* New titlebar icons, blur for titlebar on inactive

* Lint fix

* Set unfocused opacity to 0.4

* Final FINAL icons

* Fixed closing menu not returning focus to the app

* Lint fix

* Update src/browser/components/TabBar.jsx

Co-Authored-By: Guillermo Vayá <guivaya@gmail.com>

* Update src/main/Validator.js

Co-Authored-By: Guillermo Vayá <guivaya@gmail.com>

* Lint fixes

* Moved react-smooth-dnd fork to MM org and fixed another merge issue

Co-authored-by: mattermod <mattermod@users.noreply.github.com>
Co-authored-by: Guillermo Vayá <guivaya@gmail.com>

package.json

@@ -14,7 +14,8 @@
     "url": "git://github.com/mattermost/desktop.git"
   },
   "scripts": {
-    "postinstall": "electron-builder install-app-deps && npm run extract-dict",
+    "postinstall": "electron-builder install-app-deps && npm run extract-dict && npm run fix-catalina-dark-mode",
+    "fix-catalina-dark-mode": "node scripts/fix_catalina_dark_mode_debug.js",
     "extract-dict": "node scripts/extract_dict.js src/node_modules/simple-spellchecker/dict",
     "build": "npm-run-all build:*",
     "build:main": "webpack-cli --bail --config webpack.config.main.js",
@@ -64,11 +65,14 @@
     "eslint-plugin-import": "^2.14.0",
     "eslint-plugin-react": "^7.11.1",
     "file-loader": "^2.0.0",
+    "image-webpack-loader": "5.0.0",
+    "mdi-react": "^6.2.0",
     "mocha": "^5.2.0",
     "mocha-circleci-reporter": "0.0.3",
     "npm-run-all": "^4.1.5",
     "react": "^16.6.3",
     "react-dom": "^16.6.3",
+    "react-smooth-dnd": "github:mattermost/react-smooth-dnd#af6b471295007274560a375799622c1cd52d678a",
     "spectron": "^6.0.0",
     "style-loader": "^0.23.1",
     "url-loader": "^1.1.2",