Make most of GuessCaseT read-only

CFG_KEEP_UPPERCASED can probably change so keeping it writable for now.

Author: reosarevok

root/static/scripts/guess-case/types.js

@@ -28,10 +28,10 @@ export type GuessCaseModeT = {
 
 export type GuessCaseT = {
   CFG_KEEP_UPPERCASED: boolean,
-  input: GuessCaseInput,
-  mode: GuessCaseModeT,
-  output: GuessCaseOutput,
-  regexes: {
+  +input: GuessCaseInput,
+  +mode: GuessCaseModeT,
+  +output: GuessCaseOutput,
+  +regexes: {
     [regexName: string]: RegExp,
   },
 };