Big Love

Wow, it's been a long time since this project got some love. I spent the last few weeks cleaning up and polishing this console.

Notable changes:

• Updating Makefile
• Fixing off-by-one errors for DRAW (breaks backward compatibility)
• Fix initialization bug on the op variable that would cause random results.
• Added keyboard shortcuts for cursor movement and data entry
• Adding *.click4 script workflow support and documentation
• Generating the default.png from default.click4 and default_bg.png
• Correcting numerous doc typos

Special thanks to @Darenn for tons of testing during his development of the click4-ide.