Brett/Kitty/DarthCain's Chevy C3500HD bucket truck, updated for 0.4.8 RC5+

Changes from the original release:

• Fixed parser errors
• Fixed leaning
• Better command key order
• Various minor improvements

Commands:

• F1/F2 - Boom left/right
• F3/F4 - Boom up/down
• F5/56 - Boom in/out
• F7/F8 - Tilt bucket
• F11/F12 - Hood open/close