Add support for loading SpringPP savegame versions 221 and 222.

These correspond to versions from v2.1.108 and v2.1.147.
The oil rig airport type bug is fixed as of version 221.
The oil rig type has been moved, but this is not a problem as
the afterload code already remaps it to the correct value.
The cost scaling issue also seems to have been mostly fixed
as of version 221.

src/table/company_settings.ini

@@ -74,6 +74,11 @@ base     = CompanySettings
 var      = renew_keep_length
 def      = false
 
+;; allow_autoreplace_to_self
+[SDT_NULL]
+length   = 1
+extver   = SlXvFeatureTest(XSLFTO_AND, XSLFI_SPRINGPP, 2)
+
 [SDT_BOOL]
 base     = CompanySettings
 var      = vehicle.servint_ispercent

src/table/settings.ini

@@ -564,6 +564,10 @@ str      = STR_CONFIG_SETTING_MAX_BRIDGE_LENGTH
 strhelp  = STR_CONFIG_SETTING_MAX_BRIDGE_LENGTH_HELPTEXT
 strval   = STR_CONFIG_SETTING_TILE_LENGTH
 
+[SDT_XREF]
+extver   = SlXvFeatureTest(XSLFTO_AND, XSLFI_SPRINGPP, 2)
+xref     = ""construction.simulated_wormhole_signals""
+
 [SDT_VAR]
 base     = GameSettings
 var      = construction.max_bridge_height
@@ -1446,6 +1450,11 @@ def      = false
 str      = STR_CONFIG_SETTING_MULTIPINDTOWN
 strhelp  = STR_CONFIG_SETTING_MULTIPINDTOWN_HELPTEXT
 
+;; economy.allow_automatic_industries
+[SDT_NULL]
+length   = 1
+extver   = SlXvFeatureTest(XSLFTO_AND, XSLFI_SPRINGPP, 3)
+
 [SDT_NULL]
 length   = 1
 to       = 140
@@ -1587,6 +1596,7 @@ extver   = SlXvFeatureTest(XSLFTO_AND, XSLFI_SPRINGPP)
 length   = 16
 extver   = SlXvFeatureTest(XSLFTO_AND, XSLFI_SPRINGPP)
 
+; note that this has changed format in SpringPP 2.1.147
 [SDT_XREF]
 xref     = ""vehicle.pay_for_repair""
 extver   = SlXvFeatureTest(XSLFTO_AND, XSLFI_SPRINGPP)