FMSLogo Code

Add tests for the precedence of operators.

Refactor paren_infix() to make it a little easier to manipulate. Next I'm going to try to replace the recursion with iteration.

Fix bug #1607580; SETACTIVEAREA no longer changes ACTIVEAREA when given bad input.

Add logic to change the focus when pressing TAB and SHIFT+TAB on the commander history.

Add logic to simulate the commander's navigation keys from the OWL-based FMSLogo.

Make pressing the up-arrow on the numpad equivalent to pressing the up arrow.

Fix a memory leak that I introduced when I removed the extra copy from reader(). If make_strnode_no_copy() returned Null_Word, then a three-byte buffer was leaked. The code now frees that buffer.

Add logic to parse the command-line. No action is taken based on this, yet.

Add additional tests for the command-line parsing, including tests for parsing the width and height parameters.

Fix an invalid memory read bug that only recently became a problem due to the change that accepts files on the command-line. Basically, the logic would read memory beyond the end of the command line when a "-L" was given, but it would ignore all of the input until it found a NUL. After my last change, FMSLogo no longer ignored this memory, so it became more obvious that something bad was happening. I suppose this could explain some strange behavior whenever the -L parameter was given, but I have never seen any problems that I would blame on this bug.