uses cor library

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[js] extracting prototype from wrapper object ctor

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[js] cutes.trace(), tracing if CUTES_TRACE != 0

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[cutes] expose objects as Object.prototype members

Global object is frozen in QQmlEngine and context objects are not
avaialble to js code executes by QJSEngine.execute, so pass context
adding members to Object.prototype

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>