Remove "EOF-newline" lexer hack

In preparation for an upcoming change
Makes for nicer error messages, complaining about EOF instead of newlines
The hack had to be kept for the lexer raw mode to avoid a bug;
see the relevant code comment for more info.

test/asm/block-comment-termination-error.err

@@ -1,5 +1,5 @@
 ERROR: block-comment-termination-error.asm(1):
     Unterminated block comment
 ERROR: block-comment-termination-error.asm(1):
-    syntax error, unexpected newline
+    syntax error, unexpected end of file
 error: Assembly aborted (2 errors)!

test/asm/macro-eof.asm

@@ -0,0 +1,6 @@
+; Macro invocations not followed by a newline may scan an EOF;
+; If this is the case, it shouldn't cause the parse to end before the macro is expanded
+mac: macro
+	PRINTLN "Hi beautiful"
+endm
+	mac

test/asm/macro-eof.out

@@ -0,0 +1 @@
+Hi beautiful

test/asm/macro-recursion.asm

@@ -1,4 +1,4 @@
 recurse: MACRO
 	recurse
 ENDM
-	recurse
+	recurse

test/asm/pc-operand.asm

@@ -3,11 +3,13 @@ SECTION "fixed", ROM0[0]
 	rst @    ; rst 0
 	ld de, @ ; ld de, 1
 	bit @, h ; bit 4, h
-	db @, @  ; db 6, 7
+	jr @     ; jr 6
 
 SECTION "floating", ROM0
 
 	rst @    ; rst 8
 	ld l, @  ; ld l, 9
-	dw @, @  ; dw 11, 13
-	dl @, @  ; dl 15, 19
+	db @, @  ; db 11, 12
+	dw @, @  ; dw 13, 15
+	dl @, @  ; dl 17, 21
+	jr @     ; jr 25