Add fuzzer for termin_input_parser

Current state: the fuzzer find interesting input immediately...
```
terminate called after throwing an instance of 'std::range_error'
  what():  wstring_convert::from_bytes
```

See: https://github.com/ArthurSonzogni/FTXUI/issues/118

include/ftxui/component/receiver.hpp

@@ -70,6 +70,7 @@ class ReceiverImpl {
     senders_++;
     return std::unique_ptr<SenderImpl<T>>(new SenderImpl<T>(this));
   }
+  ReceiverImpl() { senders_ = 0; }
 
   bool Receive(T* t) {
     while (senders_ || !queue_.empty()) {
@@ -109,7 +110,7 @@ class ReceiverImpl {
   std::mutex mutex_;
   std::queue<T> queue_;
   std::condition_variable notifier_;
-  std::atomic<int> senders_ = 0;
+  std::atomic<int> senders_;
 };
 
 template <class T>