Enum for identifying perspectives instead of using int numbers

[lufe089]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[ ] Feature request
[ ] Documentation issue or request
[x ] Improvement request
[ ] Support request => Please do not submit support request here

Current behavior

create an enum for handling inside the perspectives source code all. In this way, the enumt will be used for each developper to know what perspective is working on instead of use numbers such as 1,2,3 etc.