Added priority feature

I've adde a priority feature so you can type c+tab h+tab l+tab for critical high low priority. I've choosed this priority because "critical" has more chars than "high" and "high" has more chars than "low" so you have the evidence of a bigger color label for high priority task.

I've also modified al themes to have the coloring in all cases
Why? it is like you cancel prev commit, what the reason?