adds macro loading from index

Закрыто nikitronn запросил слияние macro_in_index в master

Created by: zeffii

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## Number

    # this means, register the node (bl_idname)  but hide it from custom menu
    <<< SvNumberNode

    # this means add a macro for this entry, 
    #   | bl_idname | menu label | (parameters,....)
    >>> SvNumberNode Int (selected_mode="int")
    >>> SvNumberNode Float (selected_mode="float")
    Float2IntNode
    ScalarMathNode
    SvScalarMathNodeMK2

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not implemented now

I think for now i'll force single string Labels... like Int or Float above.. space separated labels should be done using some_space_separated_name , it's easy to convert underscores to space and change it to title case.