Added "string_format" script function

Rewrote ASM code of opcode handlers in MemoryOp.hpp.

artifacts/scripting/sfall function notes.txt

@@ -248,7 +248,7 @@ Some utility/math functions are available:
 - you can use this to search for a substring in a string like this: strlen(get_array(string_split(haystack, needle), 0))
 
 > string substr(string, start, length)
-- cuts a substring from a string starting at "start" up to "length" characters. The first character position starts with 0 (zero).
+- cuts a substring from a string starting at "start" up to "length" characters. The first character position is 0 (zero).
 - If start is negative - it indicates starting position from the end of the string (for example substr("test", -2, 2) will return last 2 charactes: "st").
 - If length is negative - it means so many characters will be omitted from the end of string (example: substr("test", 0, -2) will return string without last 2 characters: "te").
 - If length is zero - it will return a string from the starting position to the end of the string **New behavior** for sfall 4.2.2/3.8.22
@@ -588,6 +588,10 @@ optional arguments:
 - codePage: code page number to properly compare national characters in the range 128-255 of the ASCII code table
   available encodings: 1250-1252, 866
 
+> string sfall_func3("string_format", string format, any val1, any val2, ...)
+- formats given value using standard syntax of C printf function (google "printf" for format details). However it is limited to formatting up to 4 values
+- formatting is only supported for %s and %d. The format string is limited to 1024 characters
+
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