Serialize/deserialize scalar types

Topics
	Define to_chars to write scalar types
	To serialize user scalar types, implement the appropriate function to_chars (see also to_chars: generalized chars to value):
	Define from_chars to read scalar types
	To deserialize user scalar types, implement the function bool from_chars(csubstr buf, T *val); see from_chars: generalized chars to value.

Classes
struct	vec2< T >
	example scalar type, serialized and deserialized More...
struct	vec3< T >
	example scalar type, serialized and deserialized More...
struct	vec4< T >
	example scalar type, serialized and deserialized More...
struct	parse_only_vec2< T >
	example scalar type, deserialized only More...
struct	parse_only_vec3< T >
	example scalar type, deserialized only More...
struct	parse_only_vec4< T >
	example scalar type, deserialized only More...
struct	emit_only_vec2< T >
	example scalar type, serialized only More...
struct	emit_only_vec3< T >
	example scalar type, serialized only More...
struct	emit_only_vec4< T >
	example scalar type, serialized only More...

Detailed Description