nerf SAM (#258)

More costly (start at 1.5M), increase cost cap (4.5M), biggest timeout
(5s->10s), much lower chance to stop hydrogen (70%->10%), triple
construction time (10s->30s) otherwise it's trivial to build a SAM right
before a nuke hits

src/core/execution/SAMLauncherExecution.ts

@@ -22,7 +22,7 @@ export class SAMLauncherExecution implements Execution {
 
   private searchRange = 100;
 
-  private missileAttackRate = 50;
+  private missileAttackRate = 100; // 10 seconds
   private lastMissileAttack = 0;
 
   private pseudoRandom: PseudoRandom;