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

{
    "include" : [
        "../../Platforms/Wasm/stone-framework-loader.ts",
        "../../Platforms/Wasm/wasm-application-runner.ts",
        "../../Platforms/Wasm/wasm-viewport.ts"
    ]
}