Component decorators (#354)

Add decorator variants for decorator components

Add the "pipe" operator for components, similar to what was done for Elements.
We are able to put something like:
```
Button(...) | Maybe(&show_button)
```

Add decorators for:
- `Maybe`
- `CatchEvent`
- `Renderer`

Signed-off-by: Kefu Chai <tchaikov@gmail.com>
Co-authored-by: ArthurSonzogni <sonzogniarthur@gmail.com>

include/ftxui/component/deprecated.hpp

@@ -5,9 +5,10 @@
 
 namespace ftxui {
 
-Component Input(WideStringRef content,
-                ConstStringRef placeholder,
-                Ref<InputOption> option = {});
+[[deprecated("use Input with normal std::string instead.")]] Component Input(
+    WideStringRef content,
+    ConstStringRef placeholder,
+    Ref<InputOption> option = {});
 }  // namespace ftxui
 
 #endif /* FTXUI_COMPONENT_DEPRECATED_HPP */