* A lot more work on cursor movement/etc. for MultiLineEditTextView2

* Start mostly placeholder stuff for regular key press / insertion of text

core/string_util.js

@@ -6,6 +6,7 @@ var miscUtil	= require('./misc_util.js');
 
 exports.stylizeString	= stylizeString;
 exports.pad				= pad;
+exports.replaceAt		= replaceAt;
 
 //	:TODO: create Unicode verison of this
 var VOWELS = [ 'a', 'e', 'i', 'o', 'u' ];
@@ -145,3 +146,7 @@ function pad(s, len, padChar, dir, stringSGR, padSGR) {
 
 	return stringSGR + s;
 }
+
+function replaceAt(s, n, t) {
+    return s.substring(0, n) + t + s.substring(n + 1);
+}