tests: Add tests for button hittests, update hitTestPoint with onStage tests

tests/tests/regression_tests.rs

@@ -208,6 +208,7 @@ swf_tests! {
     (as3_boolean_constr, "avm2/boolean_constr", 1),
     (as3_boolean_negation, "avm2/boolean_negation", 1),
     (as3_boolean_tostring, "avm2/boolean_tostring", 1),
+    (as3_button_hittest, "avm2/button_hittest", 1),
     (as3_bytearray_readobject_amf0, "avm2/bytearray_readobject_amf0", 1),
     (as3_bytearray_readobject_amf3, "avm2/bytearray_readobject_amf3", 1),
     (as3_bytearray_writeobject, "avm2/bytearray_writeobject", 1),

tests/tests/swfs/avm2/button_hittest/output.txt

@@ -0,0 +1,2 @@
+// MP.hitTestObject(Btn1)
+true

tests/tests/swfs/avm2/displayobject_hittestpoint/output.txt

@@ -43,3 +43,7 @@ false
 false
 //this.symbol1_1.hitTestPoint(50.0, 50.0, true);
 false
+//this.symbol1.hitTestPoint(50.0, 50.0, true); (after removing from stage)
+false
+//this.symbol1.hitTestPoint(50.0, 50.0, false); (after removing from stage)
+true