Update for 1.57 by Cip

Update for 1.56 by Cip

updated for ETS2 1.55

changelog v.1.54.a
-adaptation for ETS2 1.54
-removed file road_look.sii (overtaking rules set as default by SCS due to latest changes)

changelog v.1.53.a
-adaptation for ETS2 1.53
same version works for 1.50-1.52 too

changelog v.1.51.a
-adaptation for ETS2 1.51
-same version works also in 1.50

changelog v1.50.b
-restored some values in traffic_data

changelog v.1.50.a
-adaptation for ETS2 1.50
-new speed rule for night time
-incresed speed at foggy weather
-spawn tweaks for some custom vehicles

changelog v.1.49.b
-adaptation for ETS2 1.49
-slight reduction of trucks spawn (in line with ATS versions)

changelog v.1.48.b
-adaptation for ETS2 1.48.5
-slight reduction of emergency vehicles