LibCore: Be explicit about integers size

This concerns all template instantiations of `ArgsParser::add_option()`
for integers.

Userland/Libraries/LibCore/ArgsParser.cpp

@@ -491,14 +491,12 @@ void ArgsParser::add_option(I& value, char const* help_string, char const* long_
     add_option(move(option));
 }
 
-template void ArgsParser::add_option(int&, char const*, char const*, char, char const*, OptionHideMode);
-template void ArgsParser::add_option(long&, char const*, char const*, char, char const*, OptionHideMode);
-template void ArgsParser::add_option(long long&, char const*, char const*, char, char const*, OptionHideMode);
-template void ArgsParser::add_option(short&, char const*, char const*, char, char const*, OptionHideMode);
-template void ArgsParser::add_option(unsigned&, char const*, char const*, char, char const*, OptionHideMode);
-template void ArgsParser::add_option(unsigned long&, char const*, char const*, char, char const*, OptionHideMode);
-template void ArgsParser::add_option(unsigned long long&, char const*, char const*, char, char const*, OptionHideMode);
-template void ArgsParser::add_option(unsigned short&, char const*, char const*, char, char const*, OptionHideMode);
+template void ArgsParser::add_option(i16&, char const*, char const*, char, char const*, OptionHideMode);
+template void ArgsParser::add_option(i32&, char const*, char const*, char, char const*, OptionHideMode);
+template void ArgsParser::add_option(i64&, char const*, char const*, char, char const*, OptionHideMode);
+template void ArgsParser::add_option(u16&, char const*, char const*, char, char const*, OptionHideMode);
+template void ArgsParser::add_option(u32&, char const*, char const*, char, char const*, OptionHideMode);
+template void ArgsParser::add_option(u64&, char const*, char const*, char, char const*, OptionHideMode);
 
 void ArgsParser::add_option(double& value, char const* help_string, char const* long_name, char short_name, char const* value_name, OptionHideMode hide_mode)
 {