Python path setting (#2409)

* Add python package
* Add python path backend config
* Add python path to system settings page
* Apply python path to script scrapers and plugins

graphql/documents/data/config.graphql

@@ -44,6 +44,7 @@ fragment ConfigGeneralData on ConfigGeneralResult {
     endpoint
     api_key
   }
+  pythonPath
 }
 
 fragment ConfigInterfaceData on ConfigInterfaceResult {

graphql/schema/types/config.graphql

@@ -107,6 +107,8 @@ input ConfigGeneralInput {
   scraperCertCheck: Boolean @deprecated(reason: "use mutation ConfigureScraping(input: ConfigScrapingInput) instead")
   """Stash-box instances used for tagging"""
   stashBoxes: [StashBoxInput!]
+  """Python path - resolved using path if unset"""
+  pythonPath: String
 }
 
 type ConfigGeneralResult {
@@ -188,6 +190,8 @@ type ConfigGeneralResult {
   scraperCertCheck: Boolean! @deprecated(reason: "use ConfigResult.scraping instead")
   """Stash-box instances used for tagging"""
   stashBoxes: [StashBox!]!
+  """Python path - resolved using path if unset"""
+  pythonPath: String!
 }
 
 input ConfigDisableDropdownCreateInput {