configure Kerwis engines (#2477)

GameData/RP-1/Tree/ECM-Engines.cfg

@@ -907,5 +907,25 @@
     XRJ55-W-1 = 5000,XRJ47-W-5
     XRJ59-MA-3 = 25000,RJ43-MA-11
     XRS-2200 = 0
-    YF-77 = 300000,HydroloxPumps
+    YF-1 = YF-Family
+    YF-100 = 75000,RD-120K
+    YF-100K = 20000,YF-100
+    YF-1A = 5000,YF-1
+    YF-1B = 10000,YF-1A
+    YF-20 = YF-Family-1971
+    YF-20B = YF-Family-1982,YF-20
+    YF-20C = 5000,YF-25K
+    YF-22 = YF-Family-1971,YF-Upper
+    YF-22B = YF-Family-1982,YF-22
+    YF-22E = 5000,YF-20C,YF-22B
+    YF-23 = YF-22
+    YF-23B = YF-22B
+    YF-25K = 5000,YF-20B
+    YF-3 = YF-Upper
+    YF-3A = 2500,YF-1B,YF-3
+    YF-73 = YF-Family-Hydrolox
+    YF-75 = 20000,YF-73
+    YF-75D = 25000,YF75
+    YF-75E = 50000,YF-75D
+    YF-77 = 300000,YF-Family-Hydrolox
 }

GameData/RP-1/Tree/ECM-Parts.cfg

@@ -1337,6 +1337,24 @@
     WL-SHUTTLE = STS
     WR-SHUTTLE = STS
     X1-Engine = XLR11-RM-3
+    YF100-Engine-double-withShell2 = YF-100
+    YF100-Engine-S = YF-100
+    YF20-Engine = YF-20
+    YF21-Engine = YF-20
+    YF21-with-shell-CZ-2 = YF-20
+    YF21-with-shell-CZ-2C = YF-20
+    YF21-with-shell-CZ-2D = YF-20
+    YF22-Engine = YF-22
+    YF23-Engine = YF-23
+    YF25K-Engine = YF-20
+    YF2-Engine = YF-1
+    YF2-with-shell = YF-1
+    YF3-Engine = YF-3
+    YF3-with-shell = YF-3
+    YF75D-Engine = YF-75
+    YF75-Engine = YF-75
+    YF77-Engine = YF-77
+    YF77-Engine-double-withShell = YF-77
     aerocam = 0
     airScoop = 1
     airplaneTail = 1

GameData/RP-1/Tree/EntryCostModifiers.cfg

@@ -162,6 +162,13 @@ ENTRYCOSTMODS
 	Early-Soviet-Staged = 40000, StagedHypergolic
 	Proton-Family = 80000, Early-Soviet-Staged
 
+	//Chinese
+	YF-Family = 10000, HypergolicPumps, RD101-TP		//similar to R-12/R-14, but smaller. Some claim these were directly derived from R-12, but I find it dubious. Sino-Soviet split occured before first R-12 flight, and YF-1 includes developments (bipropellant gas generator) that R-12/RD-214 never had. There are also claims that it was derived from Isayev booster engines (S2.1100/S2.1150) which seems dubious for the same reasons. I believe these were a mostly independent development, with minor influence from preliminary R-12/R-14 design documents. Tie to RD-100 engines, they're the last common ancestor of most of these engines and early enough engineering information was shared before Sino-Soviet split.
+	YF-Upper = 5000, YF-Family		//air-start capability and nozzle extension
+	YF-Family-1971 = 125000, YF-Family		//YF-20. These are much more RD-215-like, very nice performance for hypergolic boosters and still in service to this day. Similar costs to R-36/RD-250.
+	YF-Family-1982 = 25000, YF-Family-1971		//YF-20B. Only major upgrade to YF-20 family
+	YF-Family-Hydrolox = 30000, HydroloxPumps, PumpReignition, YF-Family		//YF-73/75. Chinese hydrogen engine, appears to be completely native and unique design
+
 	// British
 	GammaTP = 30000