Multiple fixes: signed/unsigned, etc... (#600)

Co-authored-by: ArthurSonzogni <sonzogniarthur@gmail.com>

src/ftxui/dom/table_test.cpp

@@ -6,6 +6,7 @@
 #include "ftxui/dom/table.hpp"
 #include "ftxui/screen/screen.hpp"  // for Screen
 
+// NOLINTBEGIN
 namespace ftxui {
 
 TEST(TableTest, Empty) {
@@ -731,6 +732,7 @@ TEST(TableTest, Merge) {
 }
 
 }  // namespace ftxui
+// NOLINTEND
 
 // Copyright 2021 Arthur Sonzogni. All rights reserved.
 // Use of this source code is governed by the MIT license that can be found in