support "mapping extensions" beatmaps #192
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Some maps like
Shirobon - Into the Zonemake use of theMapping Extensionsadd-on(?), in which_lineIndexand_lineLayerare not in the range 0..3, 0..2 but are instead more than 1000. This would previously cause these maps to break, generating all notes in a line on the left. The explanation of the mapping is given here, which has been copied into this code.I had to remove the indirection through
horizontalPositionsHumanized, because it does not generalize well to notes at fractional positions. Other mappings have been converted to linear functions as appropriate.