Feature/sprint 3 ux review (#1578)

* Update the payment request tables to simplify for type of user

* Improve copy on modal forms and hide create project if not possible

* Improve wording to project around uploading contract

* Vary the name of the document select form so that it doesn't clash

* Make sure get_object returns the underlying instance not the form instance

* Improve the visuals on the project page when payment requests active

* Defer loading of category object until we reference it
  * improved performance when iterating over many submissions which never look up category

* Convert to using a lazy paginator in order to avoid expensive counts
  * Table querysets are complex and doing count on this is very expensive and this can reduce /all page load times by ~50%