Move package xml before copyright

Having the same copyright on all files made the documentation script
to include it multiple times in the package information.

core/encoding/xml/debug_print.odin

@@ -1,3 +1,5 @@
+package xml
+
 /*
 	An XML 1.0 / 1.1 parser
 
@@ -9,7 +11,7 @@
 	List of contributors:
 		Jeroen van Rijn: Initial implementation.
 */
-package xml
+
 
 import "core:io"
 import "core:fmt"
@@ -81,4 +83,4 @@ print_element :: proc(writer: io.Writer, doc: ^Document, element_id: Element_ID,
 	}
 
 	return written, .None
-}
+}

core/encoding/xml/helpers.odin

@@ -1,3 +1,5 @@
+package xml
+
 /*
 	An XML 1.0 / 1.1 parser
 
@@ -6,7 +8,7 @@
 
 	This file contains helper functions.
 */
-package xml
+
 
 // Find parent's nth child with a given ident.
 find_child_by_ident :: proc(doc: ^Document, parent_id: Element_ID, ident: string, nth := 0) -> (res: Element_ID, found: bool) {
@@ -47,4 +49,4 @@ find_attribute_val_by_key :: proc(doc: ^Document, parent_id: Element_ID, key: st
 		if attr.key == key { return attr.val, true }
 	}
 	return "", false
-}
+}

core/encoding/xml/tokenizer.odin

@@ -1,3 +1,5 @@
+package xml
+
 /*
 	An XML 1.0 / 1.1 parser
 
@@ -9,7 +11,7 @@
 	List of contributors:
 		Jeroen van Rijn: Initial implementation.
 */
-package xml
+
 
 import "core:fmt"
 import "core:unicode"
@@ -433,4 +435,4 @@ scan :: proc(t: ^Tokenizer) -> Token {
 		lit = string(t.src[offset : t.offset])
 	}
 	return Token{kind, lit, pos}
-}
+}