fix: Keyboard accessible context menus (#1768)

- Makes menus fully accessible and keyboard driven
- Currently adds 2.8% to initial bundle size due to the inclusion of Reakit and its dependency, popperjs.
- Converts all menus to functional components
- Remove old custom menu system
- Various layout and flow improvements around the menus

closes #1766

yarn.lock

@@ -1365,6 +1365,11 @@
   dependencies:
     "@types/node" ">= 8"
 
+"@popperjs/core@^2.5.4":
+  version "2.6.0"
+  resolved "https://registry.yarnpkg.com/@popperjs/core/-/core-2.6.0.tgz#f022195afdfc942e088ee2101285a1d31c7d727f"
+  integrity sha512-cPqjjzuFWNK3BSKLm0abspP0sp/IGOli4p5I5fKFAzdS8fvjdOwDCfZqAaIiXd9lPkOWi3SUUfZof3hEb7J/uw==
+
 "@react-dnd/asap@^4.0.0":
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/@react-dnd/asap/-/asap-4.0.0.tgz#b300eeed83e9801f51bd66b0337c9a6f04548651"
@@ -2604,6 +2609,11 @@ bn.js@^5.0.0, bn.js@^5.1.1:
   resolved "https://registry.yarnpkg.com/bn.js/-/bn.js-5.1.3.tgz#beca005408f642ebebea80b042b4d18d2ac0ee6b"
   integrity sha512-GkTiFpjFtUzU9CbMeJ5iazkCzGL3jrhzerzZIuqLABjbwRaFt33I9tUdSNryIptM+RxDet6OKm2WnLXzW51KsQ==
 
+body-scroll-lock@^3.1.5:
+  version "3.1.5"
+  resolved "https://registry.yarnpkg.com/body-scroll-lock/-/body-scroll-lock-3.1.5.tgz#c1392d9217ed2c3e237fee1e910f6cdd80b7aaec"
+  integrity sha512-Yi1Xaml0EvNA0OYWxXiYNqY24AfWkbA6w5vxE7GWxtKfzIbZM+Qw+aSmkgsbWzbHiy/RCSkUZBplVxTA+E4jJg==
+
 boolbase@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/boolbase/-/boolbase-1.0.0.tgz#68dff5fbe60c51eb37725ea9e3ed310dcc1e776e"
@@ -10078,6 +10088,36 @@ readdirp@~3.5.0:
   dependencies:
     picomatch "^2.2.1"
 
+reakit-system@^0.15.1:
+  version "0.15.1"
+  resolved "https://registry.yarnpkg.com/reakit-system/-/reakit-system-0.15.1.tgz#bf5cc7a03f60a817373bc9cbb4a689c1f4100547"
+  integrity sha512-PkqfAyEohtcEu/gUvKriCv42NywDtUgvocEN3147BI45dOFAB89nrT7wRIbIcKJiUT598F+JlPXAZZVLWhc1Kg==
+  dependencies:
+    reakit-utils "^0.15.1"
+
+reakit-utils@^0.15.1:
+  version "0.15.1"
+  resolved "https://registry.yarnpkg.com/reakit-utils/-/reakit-utils-0.15.1.tgz#797f0a43f6a1dbc22d161224d5d2272e287dbfe3"
+  integrity sha512-6cZgKGvOkAMQgkwU9jdYbHfkuIN1Pr+vwcB19plLvcTfVN0Or10JhIuj9X+JaPZyI7ydqTDFaKNdUcDP69o/+Q==
+
+reakit-warning@^0.6.1:
+  version "0.6.1"
+  resolved "https://registry.yarnpkg.com/reakit-warning/-/reakit-warning-0.6.1.tgz#dba33bb8866aebe30e67ac433ead707d16d38a36"
+  integrity sha512-poFUV0EyxB+CcV9uTNBAFmcgsnR2DzAbOTkld4Ul+QOKSeEHZB3b3+MoZQgcYHmbvG19Na1uWaM7ES+/Eyr8tQ==
+  dependencies:
+    reakit-utils "^0.15.1"
+
+reakit@^1.3.4:
+  version "1.3.4"
+  resolved "https://registry.yarnpkg.com/reakit/-/reakit-1.3.4.tgz#1c83614130fbcee624ba510547db79c90b3435a4"
+  integrity sha512-aLR0GBOc9vELTk4PKK/zndBbIs4RSw4B7GSGY6yoMHQ/vna0iLNd5BMhjtXspD/B7hhkYERlT6di8pIyD3HSPw==
+  dependencies:
+    "@popperjs/core" "^2.5.4"
+    body-scroll-lock "^3.1.5"
+    reakit-system "^0.15.1"
+    reakit-utils "^0.15.1"
+    reakit-warning "^0.6.1"
+
 rechoir@^0.6.2:
   version "0.6.2"
   resolved "https://registry.yarnpkg.com/rechoir/-/rechoir-0.6.2.tgz#85204b54dba82d5742e28c96756ef43af50e3384"