improve initial layer settings

ultimaker.def.json is also cleaned and put in alphabetic order.
Ultimaker 2 and original are kept mostly as they were, since they are not tested. PP-42

resources/quality/ultimaker2_plus/um2p_abs_0.8_normal.inst.cfg

@@ -17,6 +17,5 @@ cool_min_layer_time = 3
 cool_min_layer_time_fan_speed_max = 25
 cool_min_speed = 15
 infill_sparse_density = 20
-speed_layer_0 = =round(speed_print * 30 / 40)
 speed_print = 40
 top_bottom_thickness = 1.2