tinyxxd 1.3.2

• Some refactoring.
• Re-order some if/elseif/else blocks based on the most used execution paths.
• Declare and initialize buffers in the main function + remove a #define.
• Add 1 to LLEN only once.
• Remove the last remaining #define by replacing it with an enum.
• Add a COLS enum instead of passing it in as an argument to several functions.
• Add (void) to a function signature so that the program also compiles on macOS.
• Various changes to benchmarks and tests.
• Update documentation.