Remove Ref<XxxOption> and add new interfaces. (#686)

1. Stop taking Ref<XxxOption> in Component constructors. Instead, use
   the XxxOption directly. Passing by copy avoid problems developers had
   where one was shared in between multiple component, causing issues.

2. Add variants of most component constructors taking a struct only.

This replaces:
https://github.com/ArthurSonzogni/FTXUI/pull/670

This fixes:
https://github.com/ArthurSonzogni/FTXUI/issues/426

CHANGELOG.md

@@ -9,10 +9,23 @@ current (development)
 - Breaking: GaugeDirection enum is renamed Direction
 - Breaking: Direction enum is renamed WidthOrHeight
 - Breaking: Remove `ComponentBase` copy constructor/assignment.
+- Breaking: MenuOption::entries is renamed MenuOption::entries_option.
+- Breaking: Ref<XxxOption> becomes XxxOption in component constructors.
 - Feature: `ResizeableSplit` now support arbitrary element as a separator.
 - Feature: `input` is now supporting multiple lines.
 - Feature: `input` style is now customizeable.
 - Bugfix: Support F1-F5 from OS terminal.
+- Feature: Add struct based constructor:
+  ```cpp
+  Component Button(ButtonOption options);
+  Component Checkbox(CheckboxOption options);
+  Component Input(InputOption options);
+  Component Menu(MenuOption options);
+  Component MenuEntry(MenuEntryOption options);
+  Component Radiobox(RadioboxOption options);
+  Component Slider(SliderOption<T> options);
+  Component ResizableSplit(ResizableSplitOption options);
+  ```
 
 ### Dom
 - Feature: Add `hyperlink` decorator. For instance: