Enable vertex shaders in custom materials

If <VertexShader> tags in custom material contain a main function, use
the shaders provided as is. The shader generator adds } to the end of
the fully custom fragment shaders so I left that also to the vertex
shader generation.

Custom attributes can be provided with a user-generated .mesh file. The
test scene has a sphere with the normal attr_pos and a sphere with an
attr_pos2 instead. "simple-pos.material" expects an attr_pos vertex
attribute and "simple-pos2.material" an attr_pos2.

Task-number: QT3DS-2026
Change-Id: I2c0cd1c079f9c741900f119aefd2e3515d42f36d
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>
Reviewed-by: Antti Määttä <antti.maatta@qt.io>
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>

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