Seperate style collection for multiple phpword instances

[RKaczmarek]

Hi,
i had a look at the style collection and it seems like there is only one static collection pool for all stored styles. And the add{element}Style method does not override the value, it rejects after first addition.

That could cause the following prolems:

• two or more instances of phpword in one script could try to add a font style with the same name.
• one of the instances could use a wrong style without even knowing about it

Maybe it would be better if phpword instances use an instance of Style to have it's own style collection pool?

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