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_pc_0.8_normal.inst.cfg

@@ -21,7 +21,6 @@ infill_overlap = =0 if infill_sparse_density > 80 else 5
 infill_sparse_density = 40
 layer_0_z_overlap = 0.22
 raft_airgap = 0.47
-speed_layer_0 = =round(speed_print * 30 / 40)
 speed_print = 40
 support_angle = 45
 support_enable = True