missile rework

fixed some math on laser tech: diffraction grating and slow light propagation
  they were giving too much damage

flechettes are slightly improved in: ammo, damage, fire rate

tech - MIRV can now stack up to 9 bonus missiles
removed tech - recursive missiles
tech: cruise missile - 50% larger size, but travels 50% slower
tech: missileBot - requires gun: missiles

js/simulation.js

@@ -522,6 +522,7 @@ const simulation = {
         tech.foamBotCount = 0;
         tech.boomBotCount = 0;
         tech.plasmaBotCount = 0;
+        tech.missileBotCount = 0;
 
         b.setFireCD();
         simulation.updateTechHUD();