Bug 692681: Pull SoftMask invocation logic together

Softmasks can be applied in 2 places in our code; once when starting a
group, once when running an XObject. The two implementations had
drifted apart. To avoid this in future, pull the two together.

This solves the bug, apart from the issue of transfer functions not
working.

Also, fix another issue seen in cluster testing. For luminance smasks
the bbox is only used to clip the contents drawn - the background color
extends into the surrounding area. Fix the code to respect this.

And another problem; text in soft masks would upset text outside the
SMasks - fix this by storing/restoring the text settings in the
interpreter state around the smask rendering.

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