Some UI improvements

- Bottom tab now only shows indices of active chat windows unless focused
- Always focus Home screen on startup instead of the last loaded conference
- Conference tab names are no longer prefixed with the conference number
- Home and Contact tab names are now capitalized

src/prompt.c

@@ -623,7 +623,7 @@ ToxWindow *new_prompt(void)
     ret->onConnectionChange = &prompt_onConnectionChange;
     ret->onFriendRequest = &prompt_onFriendRequest;
 
-    strcpy(ret->name, "home");
+    strcpy(ret->name, "Home");
 
     ChatContext *chatwin = calloc(1, sizeof(ChatContext));
     StatusBar *stb = calloc(1, sizeof(StatusBar));