Add separate header-files for each page/view

Yet another step towards removing cgit.h.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
diff --git a/ui-diff.h b/ui-diff.h
new file mode 100644
index 0000000..2307322
--- /dev/null
+++ b/ui-diff.h
@@ -0,0 +1,7 @@
+#ifndef UI_DIFF_H
+#define UI_DIFF_H
+
+extern void cgit_print_diff(const char *new_hex, const char *old_hex,
+			    const char *prefix);
+
+#endif /* UI_DIFF_H */