Fix for ticket #1562
Get PTL from VPS in case of Multi-layer OLS.
Refactor ProfileLevelTierFeatures::extractPTLInformation to accept PTL from VPS, not only from SPS.
When vps_pt_present_flag[i] == 0, infer Profile, Tier and constraint info for i-th PTL to be the same as that for (i-1)-th PTL.