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Backslash in normal lexer mode must be a line continuation

Macro args were already handled by `peek`, and character escapes
do not exist outside of string literals.

This only affects the error message printed when a non-whitespace
character comes after the backslash. Instead of "Illegal character
escape '%s'", it will print "Begun line continuation, but
encountered character '%s'".

--- a/src/asm/lexer.c

+++ b/src/asm/lexer.c

@@ -2059,29 +2059,15 @@

 		case EOF:

 			return T_EOF;

-		/* Handle escapes */

+		/* Handle line continuations */

 		case '\\':

-			c = peek(0);

-

-			switch (c) {

-			case ' ':

-			case '\r':

-			case '\n':

-				readLineContinuation();

-				break;

-

-			case EOF:

-				error("Illegal character escape at end of input\n");

-				break;

-

-			default:

-				shiftChars(1);

-				error("Illegal character escape '%s'\n", print(c));

-			}

+			// Macro args were handled by `peek`, and character escapes do not exist

+			// outside of string literals, so this must be a line continuation.

+			readLineContinuation();

 			break;

-		/* Handle identifiers and escapes... or error out */

+		/* Handle identifiers... or report garbage characters */

 		default:

 			if (startsIdentifier(c)) {