Replace calls to 'isdigit', 'isSpace' and 'isNewLine' functions to macros. Other small performance tweaks.
Replace calls to 'isdigit', 'isSpace' and 'isNewLine' functions to macros. Other small performance tweaks.

syoyo/tinyobjloader,syoyo/tinyobjloader,syoyo/tinyobjloader,syoyo/tinyobjloader