Add: settings to limit your fast-forward game speed

By default this setting is set to 2500% normal game speed.

(cherry picked from commit c3dc27e37e)

# Conflicts:
#	src/gfx.cpp
#	src/gfx_func.h
#	src/settings_type.h
#	src/video/cocoa/cocoa_v.mm
#	src/video/video_driver.cpp
#	src/video/win32_v.cpp

src/table/settings.ini

@@ -5202,6 +5202,20 @@ max      = 1000
 cat      = SC_EXPERT
 startup  = true
 
+[SDTC_VAR]
+var      = gui.fast_forward_speed_limit
+type     = SLE_UINT16
+flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
+guiflags = SGF_0ISDISABLED | SGF_NO_NETWORK
+def      = 2500
+min      = 0
+max      = 100000
+interval = 10
+str      = STR_CONFIG_SETTING_FAST_FORWARD_SPEED_LIMIT
+strhelp  = STR_CONFIG_SETTING_FAST_FORWARD_SPEED_LIMIT_HELPTEXT
+strval   = STR_CONFIG_SETTING_FAST_FORWARD_SPEED_LIMIT_VAL
+cat      = SC_BASIC
+
 [SDTC_BOOL]
 var      = sound.news_ticker
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC