Interface improvements and bump to v0.10.0

- Give window tab and statusbar a make over
- Place window tab above input field
- Reduce input field to one square in height
- Refactor window tab so that it's now a subwin of its parent ToxWindow
- Fix bug causing notification counter to sometimes increment by 2
- No longer scroll on output when output is not at bottom of screen
- Show a small indicator on far left of window tab when output is
  not at bottom of screen
- Reduce ncurses/UI thread sleep time by half
- Handle nanosleep errors better

src/log.c

@@ -306,7 +306,7 @@ int load_chat_history(ToxWindow *self, struct chatlog *log)
         line = strtok_r(NULL, "\n", &tmp);
     }
 
-    line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, 0, "");
+    line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, YELLOW, "---");
 
     free(buf);