seeded random

all runs are now seeded
seed defaults to the last 8 digits of UTC time in milliseconds
set a custom randomization seed in settings
seed controls:
    at start - boss list, mob type list, level list, horizontal flip
    during run - tech, gun, field choices, some custom level randomization
doesn't control: mob spawns, mob size, some minor level differences, specific level boss choices, ammo reward values, specific tech effects

bug fix with ground state

js/simulation.js

@@ -658,7 +658,9 @@ const simulation = {
         b.setFireMethod()
         b.setFireCD();
         // simulation.updateTechHUD();
-        powerUps.tech.choiceLog = []
+        powerUps.tech.choiceLog = [];
+        powerUps.gun.choiceLog = [];
+        powerUps.field.choiceLog = [];
         powerUps.totalPowerUps = 0;
         powerUps.research.count = 0;
         m.setFillColors();