Generate compile commands for clangd. (#855)

Fix all the diagnostics reported.

Bug: https://github.com/ArthurSonzogni/FTXUI/issues/828

src/ftxui/screen/color.cpp

@@ -6,7 +6,6 @@
 #include <array>  // for array
 #include <cmath>
 #include <cstdint>
-#include <string_view>  // for literals
 
 #include "ftxui/screen/color_info.hpp"  // for GetColorInfo, ColorInfo
 #include "ftxui/screen/terminal.hpp"  // for ColorSupport, Color, Palette256, TrueColor

src/ftxui/screen/image.cpp

@@ -1,16 +1,9 @@
 // Copyright 2020 Arthur Sonzogni. All rights reserved.
 // Use of this source code is governed by the MIT license that can be found in
 // the LICENSE file.
-#include <cstdint>  // for size_t
-#include <iostream>  // for operator<<, stringstream, basic_ostream, flush, cout, ostream
-#include <limits>
-#include <map>      // for _Rb_tree_const_iterator, map, operator!=, operator==
-#include <memory>   // for allocator, allocator_traits<>::value_type
 #include <sstream>  // IWYU pragma: keep
-#include <utility>  // for pair
 
 #include "ftxui/screen/image.hpp"
-#include "ftxui/screen/string.hpp"  // for string_width
 
 namespace ftxui {
 

src/ftxui/screen/screen.cpp

@@ -5,7 +5,6 @@
 #include <iostream>  // for operator<<, stringstream, basic_ostream, flush, cout, ostream
 #include <limits>
 #include <map>      // for _Rb_tree_const_iterator, map, operator!=, operator==
-#include <memory>   // for allocator, allocator_traits<>::value_type
 #include <sstream>  // IWYU pragma: keep
 #include <utility>  // for pair
 

src/ftxui/screen/string_internal.hpp

@@ -5,6 +5,8 @@
 #define FTXUI_SCREEN_STRING_INTERNAL_HPP
 
 #include <cstdint>
+#include <string>
+#include <vector>
 
 namespace ftxui {
 

src/ftxui/screen/util.hpp

@@ -4,8 +4,7 @@
 #ifndef FTXUI_SCREEN_UTIL_HPP
 #define FTXUI_SCREEN_UTIL_HPP
 
-namespace ftxui {
-namespace util {
+namespace ftxui::util {
 
 // Similar to std::clamp, but allow hi to be lower than lo.
 template <class T>
@@ -13,7 +12,6 @@ constexpr const T& clamp(const T& v, const T& lo, const T& hi) {
   return v < lo ? lo : hi < v ? hi : v;
 }
 
-}  // namespace util
-}  // namespace ftxui
+}  // namespace ftxui::util
 
 #endif /* end of include guard: FTXUI_SCREEN_UTIL_HPP */