FMSLogo Code

Add regression tests for FOREVER.

Fix typo

Dead Code/Dead Store removal:

Remove some legacy functions and global variables that delt with manipulating the terminal. FMSLogo will always have it's own GUI, so terminal capabilities doesn't make sense.

This change makes the code simpler and smaller, and possibly faster.

Refactoring: Rename val_status to g_ValueStatus and create manifest constants for the possible values.

The names that I chose for the values aren't that great, but it will be easy to replace them, now that they are no longer magic numbers.

Add a nascent CSS for styling the HTML generated from logohelp.xml.

Change lrepeat() and lforever() to return Unbound on error, instead of NIL. This follows the pattern of all other functions.

Also, improve some variable names.

Add regression tests for FOREVER.

Add a test for when the body of a REPEAT throws an error.
Fix the test for when the body of a REPEAT stops.

Update the version to 6.10.1+

Add regression tests for RUNRESUT, including one for bug #1547408; 'RUNRESULT {1}' crashes FMSLogo.