WIP: Upgrade develop to Laravel 6.6.1 (#7637)

I'm going ahead and merging this, since the upgrade doesn't break Flysystem any worse than the current develop is broken, so far as I can tell. 


* Upgraded framework to Laravel 6

### TO DO:

- Fix password restriction rules- the old library isn’t compatible with Laravel 6 :(
- Figure out why in-app API calls are returning “Unauthorized”

* More updates from Input:: to Request:: helper

* Switch to Request:: from Input

* Added passport config

* Fixed goofy password minimum in seeder

* Added laravel/helpers

* Changed ($item)  to ($item->id) in forms

I have no idea why this is necessary

* Changed ($item) to ($item->id) in forms

* Updated API middleware to auth:api

* Updated with added laravel auth.php values

* FIxed *&!^$%^&$^%!!!! ajax issue

* Switch to Request::get from Input::get

* Switched to Request facade

* Added password security minimums back in

The package we were using has not been updated to Laravel v6, so I created custom validators instead

* Added language strings for error messages for password rules

* Fixed `($item)` issue in formActions for partials

app/Http/Controllers/CustomFieldsetsController.php

@@ -96,7 +96,7 @@ class CustomFieldsetsController extends Controller
                 "user_id" => Auth::user()->id
         ]);
 
-        $validator = Validator::make(Input::all(), $cfset->rules);
+        $validator = Validator::make($request->all(), $cfset->rules);
         if ($validator->passes()) {
             $cfset->save();
             return redirect()->route("fieldsets.show", [$cfset->id])
@@ -188,7 +188,7 @@ class CustomFieldsetsController extends Controller
             }
         }
 
-        $results = $set->fields()->attach(Input::get('field_id'), ["required" => ($request->input('required') == "on"),"order" => $request->input('order', 1)]);
+        $results = $set->fields()->attach(Request::get('field_id'), ["required" => ($request->input('required') == "on"),"order" => $request->input('order', 1)]);
 
         return redirect()->route("fieldsets.show", [$id])->with("success", trans('admin/custom_fields/message.field.create.assoc_success'));
     }