remove .outputPath global variable from demo

This created an unnecessary warning.
change caribou plotting in caribouMovement module

addTo is now habitatQuality
colours in plotting - enhancements

- Allow cols to override the setColors
- Allow cols to be a list, as long as objects to plot or recycled
- update documentation to reflect new cols usage
fireSpread module - remove warning of overwriting objects
document for new Plot cols
update plot vignette to add polygon support
shiny_succession - update text parts

Allows better rescaling of window. When text is plotted with the Plot
function (as in a mtext), it doesn't scale perfectly with the resizing
of the shiny window
shiny_succession - change start and stop time

Now is 2005 and 2008, not 0 and 2008-2005