[AndyB] Want to buy prefix 1.0

Allows thread starter or staff to change thread prefix from want to buy to ended.

(Example of ended button)

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(Example of want to buy button)

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(Example of Options page)

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(Example of User group permissions)

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Features:

All phrases start with wanttobuyprefix_ for your convenience.

Setup:

Create the following two Thread prefixes:

Want to buy...

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