Scrap preprocessor, add .include directive instead

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/vm/obj/syn/parser.y

@@ -1,20 +1,21 @@
-%start SectionDefs
+%start Top
 %%
 
-SectionDefs -> Vec<SectionDef>:
-      SectionDefs SectionDef { $1.push($2); $1 }
-    |  { Vec::new() }
+Top -> Vec<Directive>:
+      Top Directive { $1.push($2); $1 }
+    | { Vec::new() }
     ;
 
-SectionDef -> SectionDef:
-      'DIR_META' MetaBlock { SectionDef::Meta(MetaSection { lines: $2 }) }
+Directive -> Directive:
+      'DIR_META' MetaBlock { Directive::Meta(MetaSection { lines: $2 }) }
     | 'DIR_SECTION' Name SectionOrg DataBlock {
-        SectionDef::Data(DataSection {
+        Directive::Data(DataSection {
             name: $2,
             org: $3,
             lines: $4,
         })
       }
+    | 'DIR_INCLUDE' String { Directive::Include($2) }
     ;
 
 MetaBlock -> Vec<MetaLine>: 'LBRACE' MetaLines 'RBRACE' { $2 };
@@ -158,7 +159,7 @@ use crate::vm::{
 
 fn parse_string(input: &str) -> String {
     let mut s = String::new();
-    let input = &input[1..input.bytes().len() - 2];
+    let input = &input[1..input.bytes().len() - 1];
     let mut chars = input.chars();
     while let Some(c) = chars.next() {
         if c == '\\' {