Upgraded license activation in the plugins

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Today all plugins in this shop got a revised code for the management of the user license. Activating, deactivating and checking the license status happen more stable and give back a more detailed result message. That is integrated in the plugins

Since the online shop runs on a secure protocol for some weeks the links in the plugins to the shop now point to the secure addresses.

The plugins were tested successfully with the latest version of WordPress (4.7.2).