Replace all layout container with ConstraintLayout

[cloudshooterhuman]

ConstraintLayout has proved by google that it performs about 40% better in the measure/layout phase than RelativeLayout.
I will be happy to work on this feature.

[riggaroo]

Thanks for your interest in helping improve Book Dash!

I'm weary for all the layouts to be replaced at once. Some layouts won't be able to be replaced just yet as well - for instance CoordinatorLayout. There is no equivalent using ConstraintLayout without implementing the behaviours from scratch.

You are welcome to do one by one with a pull request for each one, but just bear in mind that some wont be able to be changed just yet.

[cloudshooterhuman]

lol just seen your comment .. with pleasure!

[toravipatel]

Is this issue still open or someone already working on this? If no one is working on this than I am ready to start work on this.

[riggaroo]

Unfortunately, I no longer have much time to maintain this project.