ignore/types: add support for Seed7 files

For more info on the Seed7 programming Language see:

- on Wikipedia: https://en.wikipedia.org/wiki/Seed7
- Seed7 home:   https://seed7.sourceforge.net/
- Seed7 repo:   https://github.com/ThomasMertes/seed7

PR #3022

crates/ignore/src/default_types.rs

@@ -232,6 +232,7 @@ pub(crate) const DEFAULT_TYPES: &[(&[&str], &[&str])] = &[
     (&["rust"], &["*.rs"]),
     (&["sass"], &["*.sass", "*.scss"]),
     (&["scala"], &["*.scala", "*.sbt"]),
+    (&["seed7"], &["*.s7d", "*.s7i"]),
     (&["sh"], &[
         // Portable/misc. init files
         ".login", ".logout", ".profile", "profile",