File uploads, mostly. Also added extra behavior to addCharacter.

graph2/schema/types/Change.gql

@@ -64,6 +64,8 @@ enum ChangeModel {
   Story
   Tag
   Chapter
+  Comment
+  File
 }
 
 """

graph2/schema/types/File.gql

@@ -38,9 +38,21 @@ input FilesFilter {
   mimeTypes: [String!]
 }
 
+# Input for uploadFile mutation
+input FileUploadInput {
+  "The file name"
+  name: String!
+
+  # Whether the file should be public
+  public: Boolean!
+
+  # The actual file upload
+  file: Upload!
+}
+
 # Input for editFile mutation
 input EditFileInput {
- # The file's unique ID
+  # The file's unique ID
   id: String!
 
   # Whether the file is publicly listable. Someone with knowledge of the ID