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improved speed when switching from 'Classic' to 'Group' mode
now supports new 'UIGroup' string annotation in shaders' parameters, to allow authors to group parameters. If the 'UIGroup' string is not specified, then the semantic is used. And if none of these two are specified, the parameter stays 'ungrouped'
added an option to group all 'ungrouped' parameters
Bug fixed in v1.2:
fixed bug when creating shader from viewport (by right click -> assign new material)
file opening now occurs only once (and file opening error message shows only once too)
