Support for char32_t etc. in code coloring

The `char8_t`, `char16_t` and `char32_6` weren't code colored although they are official C++ keywords.

src/code.l

@@ -286,7 +286,7 @@ KEYWORD_OBJC ("@public"|"@private"|"@protected"|"@class"|"@implementation"|"@int
 KEYWORD ("asm"|"__assume"|"auto"|"class"|"const"|"delete"|"enum"|"explicit"|"extern"|"false"|"friend"|"gcnew"|"gcroot"|"set"|"get"|"inline"|"internal"|"mutable"|"namespace"|"new"|"null"|"nullptr"|"override"|"operator"|"pin_ptr"|"private"|"protected"|"public"|"raise"|"register"|"remove"|"self"|"sizeof"|"static"|"struct"|"__super"|"function"|"template"|"generic"|"this"|"true"|"typedef"|"typeid"|"typename"|"union"|"using"|"virtual"|"volatile"|"abstract"|"final"|"import"|"synchronized"|"transient"|"alignas"|"alignof"|"concept"|"requires"|"decltype"|{KEYWORD_OBJC}|"constexpr"|"consteval"|"constinit"|"co_await"|"co_return"|"co_yield"|"static_assert"|"noexcept"|"thread_local")
 FLOWKW  ("break"|"catch"|"continue"|"default"|"do"|"else"|"finally"|"return"|"switch"|"throw"|"throws"|"@catch"|"@finally")
 FLOWCONDITION  ("case"|"for"|"foreach"|"for each"|"goto"|"if"|"try"|"while"|"@try")
-TYPEKW  ("bool"|"byte"|"char"|"double"|"float"|"int"|"long"|"object"|"short"|"signed"|"unsigned"|"void"|"wchar_t"|"size_t"|"boolean"|"id"|"SEL"|"string"|"nullptr")
+TYPEKW  ("bool"|"byte"|"char"|"char8_t"|"char16_t"|"char32_t"|"double"|"float"|"int"|"long"|"object"|"short"|"signed"|"unsigned"|"void"|"wchar_t"|"size_t"|"boolean"|"id"|"SEL"|"string"|"nullptr")
 TYPEKWSL ("LocalObject"|"Object"|"Value")
 CASTKW ("const_cast"|"dynamic_cast"|"reinterpret_cast"|"static_cast")
 CHARLIT   (("'"\\[0-7]{1,3}"'")|("'"\\."'")|("'"[^' \\\n]{1,4}"'"))