Fix #1575: Use per-layer APS ids range for ALF APSs

new parameter AlfapsIDShift and m_apsIdStart removed from EncLibCommon, now member of EncAdaptiveLoopFilter (not reference).

• automatic range setting in encmain depending on the number of layers using ALF (improvement of JVET_X0143_ALF_APS_CHANGES) The encoder is now able to have the same base layer with different enhancement layers settings.