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

src/ftxui/component/checkbox.cpp

@@ -14,10 +14,10 @@
 namespace ftxui {
 
 namespace {
-class CheckboxBase : public ComponentBase {
+class CheckboxBase : public ComponentBase, public CheckboxOption {
  public:
-  CheckboxBase(ConstStringRef label, bool* state, Ref<CheckboxOption> option)
-      : label_(std::move(label)), state_(state), option_(std::move(option)) {}
+  explicit CheckboxBase(CheckboxOption option)
+      : CheckboxOption(std::move(option)) {}
 
  private:
   // Component implementation.
@@ -25,15 +25,14 @@ class CheckboxBase : public ComponentBase {
     const bool is_focused = Focused();
     const bool is_active = Active();
     auto focus_management = is_focused ? focus : is_active ? select : nothing;
-    auto state = EntryState{
-        *label_,
-        *state_,
+    auto entry_state = EntryState{
+        *label,
+        *checked,
         is_active,
         is_focused || hovered_,
     };
-    auto element =
-        (option_->transform ? option_->transform
-                            : CheckboxOption::Simple().transform)(state);
+    auto element = (transform ? transform : CheckboxOption::Simple().transform)(
+        entry_state);
     return element | focus_management | reflect(box_);
   }
 
@@ -48,8 +47,8 @@ class CheckboxBase : public ComponentBase {
 
     hovered_ = false;
     if (event == Event::Character(' ') || event == Event::Return) {
-      *state_ = !*state_;
-      option_->on_change();
+      *checked = !*checked;
+      on_change();
       TakeFocus();
       return true;
     }
@@ -69,8 +68,8 @@ class CheckboxBase : public ComponentBase {
 
     if (event.mouse().button == Mouse::Left &&
         event.mouse().motion == Mouse::Pressed) {
-      *state_ = !*state_;
-      option_->on_change();
+      *checked = !*checked;
+      on_change();
       return true;
     }
 
@@ -79,10 +78,7 @@ class CheckboxBase : public ComponentBase {
 
   bool Focusable() const final { return true; }
 
-  ConstStringRef label_;
-  bool* const state_;
   bool hovered_ = false;
-  Ref<CheckboxOption> option_;
   Box box_;
 };
 }  // namespace
@@ -109,10 +105,11 @@ class CheckboxBase : public ComponentBase {
 /// ```bash
 /// ☐ Make a sandwitch
 /// ```
-Component Checkbox(ConstStringRef label,
-                   bool* checked,
-                   Ref<CheckboxOption> option) {
-  return Make<CheckboxBase>(std::move(label), checked, std::move(option));
+// NOLINTNEXTLINE
+Component Checkbox(ConstStringRef label, bool* checked, CheckboxOption option) {
+  option.label = label;
+  option.checked = checked;
+  return Make<CheckboxBase>(std::move(option));
 }
 
 }  // namespace ftxui