Make "on" syntax mandatory for value sources and interceptors

Where you would have written

   x: NumberAnimation {}
   y: Behavior {}

you now must write

   NumberAnimation on x {}
   Behavior on y {}

This change also makes the parser more strict with respect to multiple
assignments to a single property - they're no longer allowed.  For example
this

   x: 10
   x: 11

is now an error.

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/auto/declarative/qdeclarativeanimations/data/properties5.qml b/tests/auto/declarative/qdeclarativeanimations/data/properties5.qml
index 38396b1..7d3cec9 100644
--- a/tests/auto/declarative/qdeclarativeanimations/data/properties5.qml
+++ b/tests/auto/declarative/qdeclarativeanimations/data/properties5.qml
@@ -9,6 +9,6 @@ Rectangle {
         color: "red"
         width: 50; height: 50
         x: 100; y: 100
-        x: NumberAnimation { targets: theRect; properties: "y"; to: 200; }
+        NumberAnimation on x { targets: theRect; properties: "y"; to: 200; }
     }
 }