extend ufuzz generator (#1783)

- property access
- property assignment
- allow bare expression within try-block
- normalise `Error` in `console.log()`
- generate more unary expressions
- add parenthesis to enforce precedence
- adjust variable reuse/creation
- add parameters to function declaration & expression
- add return expression
- add trivial arguments to function call

test/ufuzz.json

@@ -1,4 +1,21 @@
 [
+    {
+        "compress": false,
+        "mangle": false,
+        "output": {
+            "beautify": true,
+            "bracketize": true
+        }
+    },
+    {
+        "compress": false
+    },
+    {
+        "compress": {
+            "warnings": false
+        },
+        "mangle": false
+    },
     {
         "compress": {
             "warnings": false
@@ -13,24 +30,6 @@
             "toplevel": true
         }
     },
-    {
-        "compress": {
-            "warnings": false
-        },
-        "mangle": false
-    },
-    {
-        "compress": false,
-        "mangle": true
-    },
-    {
-        "compress": false,
-        "mangle": false,
-        "output": {
-            "beautify": true,
-            "bracketize": true
-        }
-    },
     {
         "compress": {
             "keep_fargs": false,