Rename asmy to more explicit parser

This should make the purpose of that file clearer to newcomers

src/asm/.gitignore

@@ -1,2 +1,2 @@
-asmy.c
-asmy.h
+/parser.c
+/parser.h

src/asm/lexer.c

@@ -36,7 +36,7 @@
 #include "asm/util.h"
 #include "asm/warning.h"
 /* Include this last so it gets all type & constant definitions */
-#include "asmy.h" /* For token definitions, generated from asmy.y */
+#include "parser.h" /* For token definitions, generated from parser.y */
 
 #ifdef LEXER_DEBUG
   #define dbgPrint(...) fprintf(stderr, "[lexer] " __VA_ARGS__)

src/asm/main.c

@@ -26,7 +26,7 @@
 #include "asm/rpn.h"
 #include "asm/symbol.h"
 #include "asm/warning.h"
-#include "asmy.h"
+#include "parser.h"
 
 #include "extern/err.h"
 #include "extern/getopt.h"