Data layer restructuring (#997)

* Move query builders to sqlite package
* Add transaction system
* Wrap model resolvers in transaction
* Add error return value for StringSliceToIntSlice
* Update/refactor mutation resolvers
* Convert query builders
* Remove unused join types
* Add stash id unit tests
* Use WAL journal mode

pkg/models/mocks/ScrapedItemReaderWriter.go

@@ -0,0 +1,59 @@
+// Code generated by mockery v0.0.0-dev. DO NOT EDIT.
+
+package mocks
+
+import (
+	models "github.com/stashapp/stash/pkg/models"
+	mock "github.com/stretchr/testify/mock"
+)
+
+// ScrapedItemReaderWriter is an autogenerated mock type for the ScrapedItemReaderWriter type
+type ScrapedItemReaderWriter struct {
+	mock.Mock
+}
+
+// All provides a mock function with given fields:
+func (_m *ScrapedItemReaderWriter) All() ([]*models.ScrapedItem, error) {
+	ret := _m.Called()
+
+	var r0 []*models.ScrapedItem
+	if rf, ok := ret.Get(0).(func() []*models.ScrapedItem); ok {
+		r0 = rf()
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).([]*models.ScrapedItem)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func() error); ok {
+		r1 = rf()
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// Create provides a mock function with given fields: newObject
+func (_m *ScrapedItemReaderWriter) Create(newObject models.ScrapedItem) (*models.ScrapedItem, error) {
+	ret := _m.Called(newObject)
+
+	var r0 *models.ScrapedItem
+	if rf, ok := ret.Get(0).(func(models.ScrapedItem) *models.ScrapedItem); ok {
+		r0 = rf(newObject)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*models.ScrapedItem)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(models.ScrapedItem) error); ok {
+		r1 = rf(newObject)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}