Feat Request: Allow shaderset creation via json

[EM4Volts]

basic shaderset msw files (non packed) are simple enough to make them a small json, consider adding that as a feature to quickly make shadersets

[EM4Volts]

idealy shadersets would use the same definition in the main json map

{ "_type": "shds", "_path": "shaderset/uberBetterPBRMain_skn.rpak" },

and then search for a json with that name, like it does for materials. if it finds a json it uses it unless there is a msw shaderset asset in there

{ "name": "shaderset/BetterPBRmain skin shader", "pixelShader": "0x27BA18638BD97577", "vertexShader": "shader/uberPseudoTesselationTest_vs_skn.rpak", "numPixelShaderTextures": 23, "numVertexShaderTextures": 0, "numSamplers": 3, "firstResourceBindPoint": 0, "numResources": 0 }