Merge branch 'JVET_O1164_RPR' into 'master'

add RPR config files

See merge request jvet/VVCSoftware_VTM!888

cfg/rpr/scale1.5x.cfg

+# Reference picture resampling CE settings for scaling ratio and number of encoded frames
+
+ScalingRatioHor                     : 1.5
+ScalingRatioVer                     : 1.5
+FractionNumFrames                   : 0.5
+UpscaledOutput                      : 1
\ No newline at end of file

cfg/rpr/scale2.0x.cfg

+# Reference picture resampling CE settings for scaling ratio and number of encoded frames
+
+ScalingRatioHor                     : 2.0
+ScalingRatioVer                     : 2.0
+FractionNumFrames                   : 0.5
+UpscaledOutput                      : 1

cfg/rpr/scale4.0x.cfg

+# Reference picture resampling CE settings for scaling ratio and number of encoded frames
+
+ScalingRatioHor                     : 4.0
+ScalingRatioVer                     : 4.0
+FractionNumFrames                   : 0.5
+UpscaledOutput                      : 1