Initial layout implementation.

examples/layout.rs

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+use factorio_blueprint::{
+    belt_finding::common::Position,
+    layout::{Layout, Problem},
+};
+use rand::SeedableRng;
+
+fn main() {
+    let mut p = Problem::new(Position::new(10, 10));
+
+    let b1 = p.add_block(Position::new(3, 2));
+    let b2 = p.add_block(Position::new(5, 2));
+    let b3 = p.add_block(Position::new(5, 7));
+
+    p.add_connection(b1, Position::new(0, 0), b2, Position::new(0, 0));
+    p.add_connection(b2, Position::new(3, 1), b3, Position::new(4, 6));
+
+    for i in 0..10 {
+        let mut rng = rand::rngs::SmallRng::seed_from_u64(i);
+
+        let l = Layout::new(&p, &mut rng);
+
+        println!("Seed: {i}, Score {}", l.score());
+        l.print();
+    }
+}