Add variadic arguments

[armoha]

settbl, StringBuffer.print, eprintln are functions with variadic arguments but there's no ergonomic way to use them in classic view. Lua function is not intuitive; it has no difference between writing code manually and not beginner friendly.

Better interface proposal:

• settbl
  Replace [StatTxtTbl] from start position [Offset] with new text: [Add more..]
  (encoding: [CP949]) <- optional with default value

Stepwise example to write settbl("Marshal (Rank)", 0, PColor(p), "测试", encoding="utf-8");

1. settbl
   Replace ["Marshal (Rank)"] from start position [0] with new text: [Add more..]
   (encoding: [UTF-8])
2. settbl
   Replace ["Marshal (Rank)"] from start position [0] with new text: [PColor(p)] [Add more..]
   (encoding: [UTF-8])
3. settbl
   Replace ["Marshal (Rank)"] from start position [0] with new text: [PColor(p)] ["测试"] [Add more..]
   (encoding: [UTF-8])