AOM_QM: redesign matrices and support CB_4X4 and RECT-TX.
All matrices are derived by subsampling 32x32 and 32x16 matrices. Inter and intra matrices now use the same matrix set. BUG=aomedia:520 AWCY results for default setting (qm-min=5, qm-max=9): PSNR | PSNR Cb | PSNR Cr | PSNR HVS | SSIM | MS SSIM | CIEDE 2000 2.75 | 7.98 | - | -3.52 | 0.73 | -2.21 | 4.22 Change-Id: I8414d19eaf50cfe80d4fe2290da6cdf4ebb406cb
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