Added a way to specificy which structures are to be initially displayed (the default being ALL structures displayed) + the loader maintains a list of structure display state, that can be modified continuously + the cache now takes the initial list of structure into account for computing the entry + added methods to change the loaded structure visibility + disabled the alternate loaders (DicomStructureSetLoader2 and friends) + disabled corresponding tests

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  margin: 0px;
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  display: block;  /* No floating content on sides */
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canvas {
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