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allow more characters + clear with ESC

	allow more than alnum chars as input
	ESC key clears the input or app exits if no input

--- a/main.c

+++ b/main.c

@@ -192,6 +192,13 @@

 				plumbsendtext(plumbfd, argv0, nil, pwd, m.n);

 		}

 		break;

+	case Kesc:

+		if(ninput > 0){

+			ninput = 0;

+			inputchanged();

+		}else

+			threadexitsall(nil);

+		break;

 	case Kbs:

 		if(ninput > 0){

 			ninput--;

@@ -204,7 +211,7 @@

 			inputchanged();

 		}

 	default:

-		if(isalnum(k)){

+		if(isprint(k)){

 			input[ninput++] = (char)k; /* XXX */

 			inputchanged();

 		}