STL rework

- fixed lots of bugs
- overlay libraries work correctly and reliably
- the STL is an overlay library
- examples updated

src/utils/mod.rs

@@ -3,6 +3,7 @@ mod print_nname;
 mod pushed;
 mod replace_first;
 mod side;
+mod split_max_prefix;
 mod string_from_charset;
 mod substack;
 mod unwrap_or;
@@ -12,6 +13,7 @@ pub use print_nname::sym2string;
 pub use pushed::pushed;
 pub use replace_first::replace_first;
 pub use side::Side;
+pub use split_max_prefix::split_max_prefix;
 pub use substack::{Stackframe, Substack, SubstackIterator};
 pub(crate) use unwrap_or::unwrap_or;
 pub mod iter;