Include all dependecies in df headers

This allows including df/*.h without including any dependecies first. It
also helps ycm error reporting to avoid wrong errors when opening
headers when it tries to compile header as c++ source file.

Bitfield.pm

@@ -94,6 +94,8 @@ sub render_bitfield_core {
             emit "static bitfield_identity identity;";
             emit "static bitfield_identity *get() { return &identity; }";
         } "template<> struct ${export_prefix}identity_$traits_name ", ";";
+        header_ref("Export.h");
+        header_ref("DataDefs.h");
     };
 
     with_emit_static {

Common.pm

@@ -204,6 +204,9 @@ sub get_primitive_base($;$) {
     my ($tag, $default) = @_;
 
     my $base = $tag->getAttribute('base-type') || $default || 'uint32_t';
+    if ($base =~ /u?int[136]?[2468]_t/) {
+        header_ref("cstdint");
+    }
     $primitive_types{$base} or die "Must be primitive: $base\n";
 
     return $base;

Enum.pm

@@ -91,6 +91,8 @@ sub render_enum_tables($$$$$$) {
             emit "static enum_identity identity;";
             emit "static enum_identity *get() { return &identity; }";
         } "template<> struct ${export_prefix}identity_$traits_name ", ";";
+        header_ref("Export.h");
+        header_ref("DataDefs.h");
     };
 
     # Enumerate enum attributes

StructFields.pm

@@ -39,6 +39,8 @@ sub with_struct_block(&$;$%) {
     my $is_union = is_attr_true($tag,'is-union');
     my $kwd = ($is_union ? "union" : "struct");
     my $exp = $export_prefix; #$flags{-export} ? $export_prefix : '';
+    header_ref("Export.h");
+    header_ref("DataDefs.h");
     my $prefix = $kwd.' '.$exp.($name ? $name.' ' : '');
 
     emit_comment $tag, -attr => 1;

codegen.pl

@@ -96,6 +96,7 @@ BEGIN
                     my $prefix = get_container_item_type($tag, -weak => 1, -void => 'void');
                     emit_comment $tag;
                     emit 'extern ', $export_prefix, $prefix, ' *', $name, ';', get_comment($tag);
+                    header_ref("Export.h");
 
                     push @items, [ $prefix, $name ];
                     push @fields, $tag->findnodes('ld:item');