Create new interfaces for objects transmitted using the REST API

Changes:
- Create new IContact, IAccount, and IConversation interfaces in common/
    - These interfaces represent the serialized versions of the models which are transferred
    - The client models are classes which implement these interfaces
- Create new LookupResult interface for nameserver lookup results
- Create new IConversationMember interface for conversation members
    - The client interface ConversationMember extends this interface to have a Contact field rather than IContact
- Create new ConversationInfos interface for conversation infos
- Create new ContactDetails interface for contact details (used by contacts routes)
- Move request and response body interfaces into common/
- Merge AccountConfig into AccountDetails interface
- Create interfaces for server-only objects:
    - ConversationMemberInfos
    - ConversationRequestMetadata
- Ensure interfaces in jami-signal-interfaces.ts do not contain fields with JamiSwig types
- Rename models/ filenames to camelCase as they are not components
- Rewrite client models to have proper TypeScript accessors and remove unused getters
- Rewrite how client models are initialized from the serialized interface using .fromInterface static methods
- Make client models implement the interfaces in common/ for consistency
- Remove unneeded _next parameter for Express.js route handlers
- Use Partial<T> for all Express.js request body types on server
- Type all Axios response body types with interfaces

GitLab: #92
Change-Id: I4b2c75ac632ec5d9bf12a874a5ba04467c76fa6d
diff --git a/client/src/contexts/ConversationProvider.tsx b/client/src/contexts/ConversationProvider.tsx
index b927278..8d5f7b5 100644
--- a/client/src/contexts/ConversationProvider.tsx
+++ b/client/src/contexts/ConversationProvider.tsx
@@ -21,7 +21,7 @@
 import LoadingPage from '../components/Loading';
 import { createOptionalContext } from '../hooks/createOptionalContext';
 import { useUrlParams } from '../hooks/useUrlParams';
-import { Conversation } from '../models/Conversation';
+import { Conversation } from '../models/conversation';
 import { ConversationRouteParams } from '../router';
 import { useConversationQuery } from '../services/conversationQueries';
 import { WithChildren } from '../utils/utils';
@@ -51,7 +51,7 @@
 
   useEffect(() => {
     if (conversationQuery.isSuccess) {
-      const conversation = Conversation.from(accountId, conversationQuery.data);
+      const conversation = Conversation.fromInterface(conversationQuery.data);
       setConversation(conversation);
     }
   }, [accountId, conversationQuery.isSuccess, conversationQuery.data]);