Add SFW content mode option (#6262)

* Use more neutral language for content
* Add sfw mode setting
* Make configuration context mandatory
* Add sfw class when sfw mode active
* Hide nsfw performer fields in sfw mode
* Hide nsfw sort options
* Hide nsfw filter/sort options in sfw mode
* Replace o-count with like counter in sfw mode
* Use sfw label for o-counter filter in sfw mode
* Use likes instead of o-count in sfw mode in other places
* Rename sfw mode to sfw content mode
* Use sfw image for default performers in sfw mode
* Document SFW content mode
* Add SFW mode setting to setup
* Clarify README
* Change wording of sfw mode description
* Handle configuration loading error correctly
* Hide age in performer cards

graphql/schema/types/config.graphql

@@ -2,6 +2,8 @@ input SetupInput {
   "Empty to indicate $HOME/.stash/config.yml default"
   configLocation: String!
   stashes: [StashConfigInput!]!
+  "True if SFW content mode is enabled"
+  sfwContentMode: Boolean
   "Empty to indicate default"
   databaseFile: String!
   "Empty to indicate default"
@@ -341,6 +343,9 @@ type ConfigImageLightboxResult {
 }
 
 input ConfigInterfaceInput {
+  "True if SFW content mode is enabled"
+  sfwContentMode: Boolean
+
   "Ordered list of items that should be shown in the menu"
   menuItems: [String!]
 
@@ -407,6 +412,9 @@ type ConfigDisableDropdownCreate {
 }
 
 type ConfigInterfaceResult {
+  "True if SFW content mode is enabled"
+  sfwContentMode: Boolean!
+
   "Ordered list of items that should be shown in the menu"
   menuItems: [String!]