v7.0.0

• Code cleanup
• Decreased engine size
• Updated Vertex Adventure sample code
• Removed env_soundscape
• Removed trace
• Fixed various UI controls not using their accessor methods internally
• Updated entity draw loop
• Added entity:drawBoundingBoxes()
• Added panel:drawBackground()
• Added panel:drawForeground()
• Added mutator()
• Added accessor()
• Removed framebuffer:getDesiredWidth()
• Removed framebuffer:getDesiredHeight()
• Added panel:preDraw()
• Added panel:postDraw()