Everywhere: Debug macros instead of constexpr.

This was done with the following script:

    find . \( -name '*.cpp' -o -name '*.h' -o -name '*.in' \) -not -path './Toolchain/*' -not -path './Build/*' -exec sed -i -E 's/dbgln<debug_([a-z_]+)>/dbgln<\U\1_DEBUG>/' {} \;

    find . \( -name '*.cpp' -o -name '*.h' -o -name '*.in' \) -not -path './Toolchain/*' -not -path './Build/*' -exec sed -i -E 's/if constexpr \(debug_([a-z0-9_]+)/if constexpr \(\U\1_DEBUG/' {} \;

Userland/Libraries/LibGUI/JSSyntaxHighlighter.cpp

@@ -108,7 +108,7 @@ void JSSyntaxHighlighter::rehighlight(Gfx::Palette palette)
         spans.append(span);
         advance_position(str[str.length() - 1]);
 
-        dbgln<debug_syntax_highlighting>("{}{} @ '{}' {}:{} - {}:{}",
+        dbgln<SYNTAX_HIGHLIGHTING_DEBUG>("{}{} @ '{}' {}:{} - {}:{}",
             token.name(),
             is_trivia ? " (trivia)" : "",
             token.value(),