A tokenizer for LaTeX. \GetTokens{Target1}{Target2}{Source} splits source into two tokens at the first encounter of a comma. The first token is saved in a newly created command with the name passed as <Target1> and the second token likewise. A package option ‘trim’ causes leading and trailing space to be removed from each token; with this option, the \TrimSpaces command is defined, which removes leading and trailing spaces from its argument.