Enable wipe tower on non solulable multimaterial prints

[tsamisa]

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[tsamisa]

First of all i apologize if this is requested before. The wipe tower is disabled if i user support with a materials that is not solulable and has a top contact other than 0. There sometimes the need to print with a support material that is not easily detachable from the main print so we need a z contact > 0. Or we want to print with a .15 layer height and there is no solulable option. Please allow for the wipe tower to be enabled. Add a warning or an experimental tag similar with other options.