finalBoss rework

finalBoss rework
  (this is pretty raw, so expect a bug and balance patch soon)
  finalBoss goes invulnerable a few times as it loses health
  finalBoss damage reduction is higher
    finalBoss damage reduction slowly decays as you do any damage to the boss
      damage reduction resets to normal with each new invulnerability phase
  after each invulnerability phase it randomly adds 1 more attack mode
      lasers, black hole, mines, hoppers, seekers, mobs, orbiters, oscillation

mobs die below 0.05 -> 0.01 health
  might cause bugs, but testing this out

guns and field power ups show 3 -> 2 options

bug fixes:

js/bullet.js

@@ -3931,6 +3931,10 @@ const b = {
         if (!mob.shield && Vector.dot(Vector.normalise(Vector.sub(mob.position, bullet.position)), Vector.normalise(bullet.velocity)) > 0.99 - 4 / mob.radius) {
             let cycle = () => { //makes this run after damage
                 if (mob.health < 0.5 && mob.damageReduction > 0 && mob.alive) {
+                    // mob.death();
+                    // mob.damage(this.health * Math.sqrt(this.mass) / this.damageReduction);
+                    mob.damage(Infinity);
+
                     const color = 'rgb(255,255,255)'
                     simulation.drawList.push({
                         x: mob.position.x,
@@ -3953,7 +3957,6 @@ const b = {
                         color: color, //"rgb(0,0,0)",
                         time: 20
                     });
-                    mob.death();
                 }
             }
             requestAnimationFrame(cycle);
@@ -5328,7 +5331,6 @@ const b = {
                             b.explosion(this.position, 300 + 40 * Math.random()); //makes bullet do explosive damage at end
                         }
                     } else if (tech.isCritKill) b.crit(who, this)
-
                     if (tech.isNailRadiation) mobs.statusDoT(who, 7 * (tech.isFastRadiation ? 0.7 : 0.24), tech.isSlowRadiation ? 360 : (tech.isFastRadiation ? 60 : 180)) // one tick every 30 cycles
                     if (this.speed > 4 && tech.fragments) {
                         b.targetedNail(this.position, 1.25 * tech.fragments * tech.bulletSize)
@@ -6595,7 +6597,6 @@ const b = {
                     ctx.fill();
 
                     if (this.isDischarge && m.cycle % 2) {
-                        this.charge -= 0.75
                         const spread = (input.down ? 0.04 : 0.5) * (Math.random() - 0.5)
                         const radius = 5 + 8 * Math.random() + (tech.isAmmoFoamSize && this.ammo < 300) * 12
                         const SPEED = (input.down ? 1.2 : 1) * 10 - radius * 0.4 + Math.min(5, Math.sqrt(this.charge));
@@ -6609,6 +6610,7 @@ const b = {
                             y: m.pos.y + 30 * Math.sin(m.angle)
                         }
                         b.foam(position, Vector.rotate(velocity, spread), radius)
+                        this.charge -= 0.75
                         m.fireCDcycle = m.cycle + 2; //disable firing and adding more charge until empty
                     } else if (!input.fire) {
                         this.isDischarge = true;