rework hires prompts/sampler code to among other things support different extra networks in first/second pass

rework quoting for infotext items that have commas in them to use json (should be backwards compatible except for cases where it didn't work previously)
add some locals from processing function into the Processing class as fields

modules/generation_parameters_copypaste.py

@@ -1,5 +1,6 @@
 import base64
 import io
+import json
 import os
 import re
 
@@ -34,13 +35,20 @@ def reset():
 
 
 def quote(text):
-    if ',' not in str(text):
+    if ',' not in str(text) and '\n' not in str(text):
         return text
 
-    text = str(text)
-    text = text.replace('\\', '\\\\')
-    text = text.replace('"', '\\"')
-    return f'"{text}"'
+    return json.dumps(text, ensure_ascii=False)
+
+
+def unquote(text):
+    if len(text) == 0 or text[0] != '"' or text[-1] != '"':
+        return text
+
+    try:
+        return json.loads(text)
+    except Exception:
+        return text
 
 
 def image_from_url_text(filedata):
@@ -261,7 +269,9 @@ Steps: 20, Sampler: Euler a, CFG scale: 7, Seed: 965400086, Size: 512x512, Model
     res["Negative prompt"] = negative_prompt
 
     for k, v in re_param.findall(lastline):
-        v = v[1:-1] if v[0] == '"' and v[-1] == '"' else v
+        if v[0] == '"' and v[-1] == '"':
+            v = unquote(v)
+
         m = re_imagesize.match(v)
         if m is not None:
             res[f"{k}-1"] = m.group(1)
@@ -269,11 +279,6 @@ Steps: 20, Sampler: Euler a, CFG scale: 7, Seed: 965400086, Size: 512x512, Model
         else:
             res[k] = v
 
-        if k.startswith("Hires prompt"):
-            res["Hires prompt"] = v[1:][:-1].replace(';', ',')
-        elif k.startswith("Hires negative prompt"):
-            res["Hires negative prompt"] = v[1:][:-1].replace(';', ',')
-
     # Missing CLIP skip means it was set to 1 (the default)
     if "Clip skip" not in res:
         res["Clip skip"] = "1"
@@ -286,6 +291,15 @@ Steps: 20, Sampler: Euler a, CFG scale: 7, Seed: 965400086, Size: 512x512, Model
         res["Hires resize-1"] = 0
         res["Hires resize-2"] = 0
 
+    if "Hires sampler" not in res:
+        res["Hires sampler"] = "Use same sampler"
+
+    if "Hires prompt" not in res:
+        res["Hires prompt"] = ""
+
+    if "Hires negative prompt" not in res:
+        res["Hires negative prompt"] = ""
+
     restore_old_hires_fix_params(res)
 
     # Missing RNG means the default was set, which is GPU RNG