add rename project feature

[Gregmus2]

Hello @ajaxray

This adds Rename project button to project activities along with Delete project and Clear tasks

I would like to contribute because I like your app and I would like to use it. But I missed many features, so I'm gonna add them and help you to improve the tool if you will accept my help. I tried to write in the same style and not break your structure to not cause any inconvenience for you as author and developer, hope it will work for you