* 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%

* Fix the approve contract and approve forms

* make sure we can share error messages with the user

* add tooltip logic for submit for approval button
* update error bar styling on project page
* add tooltips and add to disabled button

* Add Contract model
* Add upload contract form and button
* Show recent contracts in the sidebar
* Add contract approval
* Allow applicants and staff to upload contracts
* Advance a Project's state when a contract is approved
* Capture applicant flow in contract access templatetag

ref #1378 

* Display remaining document categories in approval form

Ref #1345

* Make activities private where appropriate
    * APPROVE_PROJECT,
    * REQUEST_PROJECT_CHANGE,
    * SEND_FOR_APPROVAL,
*Updates to project detail page to crate a "flow" of PAF > request approval > approve or request changes.

* Add Approval creation form & view
* Add Rejections
* Display approvals in the sidebar

Ref #1333

* Add Approvers role
* Add Approval model
* Add send for Approval functionality to Project
* Send approval message request to approvers in slack

Ref #1332

* Add lead ForeignKey to Project
* Add form and modal to change Project.lead
* Display current Project.lead along with Fund & Round info