* collect DL indices in RTree for clip culling
* fix bounds in unit test and minor opt in Dispatch
* normalize inline matrix objects and minor fixes to unit test
* remove over-eager DCHECK and improve R-Tree comments
* formatting
* include vector for Windows
* method rename and distribute child nodes more evenly
* add R-Tree specific unit tests and debug checks
* add comments about geometry to R-Tree unit tests and adjust spacing
* licenses
* licenses attempt 2
* fix potential overflow with uint32_t
* aggressively const DisplayList fields and methods
* add implementation comments per review feedback
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