Add routing for call page

Enable buttons to start a call.
Improve ConversationListItem context menu layout.
Move calling buttons from `Button.tsx` to `CallButtons.tsx`.
Add CallProvider

GitLab: #78
Change-Id: I921aa11383bf39fae18e59b01afb00dc66b0d5e6
diff --git a/client/src/pages/JamiMessenger.tsx b/client/src/pages/JamiMessenger.tsx
index 197a3fb..2cb485b 100644
--- a/client/src/pages/JamiMessenger.tsx
+++ b/client/src/pages/JamiMessenger.tsx
@@ -17,13 +17,18 @@
  */
 import { Route, Routes } from 'react-router-dom';
 
+import { RouteParams } from '../utils/hooks';
+import CallInterface from './CallInterface';
 import Messenger from './Messenger';
 
+export type CallRouteParams = RouteParams<{ conversationId: string }, { video?: 'true' }>;
+
 export default function JamiMessenger() {
   return (
     <Routes>
       <Route path="addContact/:contactId" element={<Messenger />} />
       <Route path="conversation/:conversationId" element={<Messenger />} />
+      <Route path="call/:conversationId" element={<CallInterface />} />
       <Route path="*" element={<Messenger />} />
     </Routes>
   );