Backported "draw_image" and "draw_image_scaled" functions from 4.1

artifacts/scripting/sfall function notes.txt

@@ -522,6 +522,18 @@ Some utility/math functions are available:
 - there is also a unique ID number range for the player and party members from 18000 to 83535
 - to assign a new ID number generated by the engine to the object (i.e. unassign a unique ID), call the function with two arguments and pass -1 for the flag argument
 
+> void sfall_func5("draw_image", string/int pathFile/artId, int frame, int x, int y, bool noTransparent)
+> void sfall_func6("draw_image_scaled", string/int pathFile/artId, int frame, int x, int y, int width, int height)
+- displays the specified FRM image in the active window created by vanilla CreateWin or sfall's create_win script function
+- pathFile/artId: path to the FRM file (e.g. "art\\inven\\5mmap.frm"), or its FRM ID number (e.g. 117440550, see specification of the FID format)
+optional arguments:
+- frame: frame number, the first frame starts from zero
+- x/y: offset relative to the top-left corner of the window
+- width/height: image size, used to scale the image when displaying it. Pass -1 to either width or height to keep the aspect ratio when scaling
+- noTransparent: pass true to display an image without transparent background
+- NOTE: to omit optional arguments starting from the right, call the functions with different sfall_funcX (e.g. sfall_func4("draw_image", pathFile, frame, x, y))
+- if draw_image_scaled is called without x/y/width/height arguments, the image will be scaled to fit the window without transparent background
+
 > void sfall_func2("unwield_slot", object critter, int slot)
 - unequips an item from the specified slot for a critter or the player
 - can take off player's equipped item when the inventory is opened, or the player is in the barter screen