api: Flatten and simplify Servo preferences (#34966)

Flatten and simplify Servo's preferences code. In addition, have both
preferences and options passed in as arguments to `Servo::new()` and
make sure not to use the globally set preferences in `servoshell` (as
much as possible now).

Instead of a complex procedural macro to generate preferences, just
expose a very simple derive macro that adds string based getters and
setters.

- All command-line parsing is moved to servoshell.
- There is no longer the concept of a missing preference.
- Preferences no longer have to be part of the resources bundle because
  they now have reasonable default values.
- servoshell specific preferences are no longer part of the preferences
  exposed by the Servo API.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>

tests/wpt/mozilla/meta/css/animations/__dir__.ini

@@ -1,2 +1,2 @@
-prefs: ["layout.animations.test.enabled:true",
-        "dom.testbinding.enabled:true"]
+prefs: ["layout_animations_test_enabled:true",
+        "dom_testbinding_enabled:true"]

tests/wpt/mozilla/meta/css/animations/animation-events.html.ini

@@ -1,2 +1,2 @@
-prefs: ["layout.animations.test.enabled:false",
-        "dom.testbinding.enabled:false"]
+prefs: ["layout_animations_test_enabled:false",
+        "dom_testbinding_enabled:false"]

tests/wpt/mozilla/meta/css/animations/transition-events.html.ini

@@ -1,3 +1,3 @@
-prefs: ["layout.animations.test.enabled:false",
-        "dom.testbinding.enabled:false"]
+prefs: ["layout_animations_test_enabled:false",
+        "dom_testbinding_enabled:false"]
 

tests/wpt/mozilla/meta/css/flex_align_content_stretch_subpixel.html.ini

@@ -1,2 +1,2 @@
 [flex_align_content_stretch_subpixel.html]
-  prefs: ["layout.flexbox.enabled:true"]
+  prefs: ["layout_flexbox_enabled:true"]

tests/wpt/mozilla/meta/mozilla/DOMParser-parseFromString.html.ini

@@ -1,2 +1,2 @@
 [DOMParser-parseFromString.html]
-  prefs: ["dom.servoparser.async_html_tokenizer.enabled:true"]
+  prefs: ["dom_servoparser_async_html_tokenizer_enabled:true"]

tests/wpt/mozilla/meta/mozilla/dictionary_to_jsval.html.ini

@@ -1,2 +1,2 @@
 [dictionary_to_jsval.html]
-  prefs: [dom.testbinding.enabled:true]
+  prefs: [dom_testbinding_enabled:true]

tests/wpt/mozilla/meta/mozilla/exceptionToRejection.any.js.ini

@@ -1,7 +1,7 @@
 [exceptionToRejection.any.html]
   type: testharness
-  prefs: [dom.testbinding.enabled:true]
+  prefs: [dom_testbinding_enabled:true]
 
 [exceptionToRejection.any.worker.html]
   type: testharness
-  prefs: [dom.testbinding.enabled:true]
+  prefs: [dom_testbinding_enabled:true]

tests/wpt/mozilla/meta/mozilla/interfaces.https.html.ini

@@ -1 +1 @@
-prefs: [dom.webxr.test: false]
+prefs: [dom_webxr_test: false]

tests/wpt/mozilla/meta/mozilla/like.any.js.ini

@@ -1,6 +1,6 @@
 [like.any.html]
   type: testharness
-  prefs: [dom.testbinding.enabled:true]
+  prefs: [dom_testbinding_enabled:true]
   [Test defaulting arguments on setlike to undefined]
     expected: FAIL
 
@@ -12,7 +12,7 @@
 
 [like.any.worker.html]
   type: testharness
-  prefs: [dom.testbinding.enabled:true]
+  prefs: [dom_testbinding_enabled:true]
   [Test defaulting arguments on setlike to undefined]
     expected: FAIL
 

tests/wpt/mozilla/meta/mozilla/media_query_list_gc.html.ini

@@ -1 +1 @@
-prefs: ["dom.servo_helpers.enabled:true"]
+prefs: ["dom_servo_helpers_enabled:true"]

tests/wpt/mozilla/meta/mozilla/ns.any.js.ini

@@ -1,7 +1,7 @@
 [ns.any.html]
   type: testharness
-  prefs: [dom.testbinding.enabled:true]
+  prefs: [dom_testbinding_enabled:true]
 
 [ns.any.worker.html]
   type: testharness
-  prefs: [dom.testbinding.enabled:true]
+  prefs: [dom_testbinding_enabled:true]

tests/wpt/mozilla/meta/mozilla/overload_dict.html.ini

@@ -1,3 +1,3 @@
 [overload_dict.html]
   type: testharness
-  prefs: [dom.testbinding.enabled:true]
+  prefs: [dom_testbinding_enabled:true]

tests/wpt/mozilla/meta/mozilla/prototypes.html.ini

@@ -1 +1 @@
-prefs: ["dom.servo_helpers.enabled:true"]
+prefs: ["dom_servo_helpers_enabled:true"]

tests/wpt/mozilla/meta/mozilla/sequence-hole.html.ini

@@ -1,2 +1,2 @@
 [sequence-hole.html]
-  prefs: [dom.testbinding.enabled:true]
+  prefs: [dom_testbinding_enabled:true]

tests/wpt/mozilla/meta/mozilla/trace_null.html.ini

@@ -1 +1 @@
-prefs: ["dom.servo_helpers.enabled:true"]
+prefs: ["dom_servo_helpers_enabled:true"]

tests/wpt/mozilla/meta/mozilla/transitionend_safety.html.ini

@@ -1 +1 @@
-prefs: ["dom.servo_helpers.enabled:true"]
+prefs: ["dom_servo_helpers_enabled:true"]

tests/wpt/mozilla/meta/mozilla/weakref.html.ini

@@ -1,3 +1,3 @@
 [weakref.html]
   type: testharness
-  prefs: ["dom.testbinding.enabled:true", "dom.servo_helpers.enabled:true"]
+  prefs: ["dom_testbinding_enabled:true", "dom_servo_helpers_enabled:true"]