Moving to V4VM TypedArrays in Qt 5.5 dev.

This commit breaks compatibility with Qt 5.4 and earlier versions. It removes the
temporary QObject based TypedArrays and moves the code to use the native
QV4::TypedArray support in Qt 5.5. This allows the implementation now to also
add support for compressed textures and support all getParameter() values.

Change-Id: I637083e8ebad46b77617ca4095cefaa5aab48b0b
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>