activations, constraints, initializers, losses, regularizers: move Ops param from CTOR to call method

[JimClarke5]

This PR moves the Ops parameter out of the class CTORs into their respective call methods. Also, an interface was created for each package for the respective call method. These packages were chosen because they are stateless wrt the Graph (e.g. no Variables).

There is no change in functionality of these classes, just the move of the Ops parameter to call.

This is related to issue: #327

[karllessard]

Will merge after #331, if the quick-build passes.

[karllessard]

@JimClarke5 , can you rebase your PR so that we can validate now that the quick-build is passing?

[JimClarke5]

@karllessard I think I have rebased it. Give it a try.

[karllessard]

It failed again, looks like it’s the javadoc trouble that is back :-|

If I remember correctly, the fix for that was to enforce building in Java8, that has not changed as far as I know

Wait, I think I'm confusing things... I'll try to demystify that later

[karllessard]

I see that you merged master to your branch, I don’t think that’s the issue but rebasing is always better. You can drop your last commit (the merge one) and retry with git rebase?

[karllessard]

Oh wait, in fact, these javadoc errors are real errors this time :)

Can you please fix them and push a new version?

[JimClarke5]

@karllessard@rnett The "check format" is erroring on lines between imports. I ran google-java-format against all my files so I don't understand why this is happening.

[karllessard]

The way to reformat now is to run mvn spotless:apply, can you give it a try?

[JimClarke5]

@karllessard I did the mvn spotless:apply, looks check-format passed this time.