Various Fixes

Big shout-out to the helpful folks over in https://www.reddit.com/r/Games/comments/z670x0/dont_die_collect_loot_dan_marchan... who gave a ton of useful feedback! This patch incorporates some quick fixes for quirks and bugs identified in that post:

• Corrected the damage calculation on "Thicc Shields" to properly add flat physical damage instead of attempting to multiply
• Enemy projectiles no longer disappear on death
• Enemies significantly off screen can no longer be hit by projectiles
• Shockwave's AoE scaling only applies to the collision detection used between it and enemies. The environmental collision remains at the default size, preventing situations where scaling the AoE actually makes the skill tougher to use
• Shockwave no longer moves when the game is paused
  
• You can no longer gain experience, health, or mana while dead (lol)
• The passive display on the Warrior and Hero skill trees no longer erroneously counts item +skills
• Item +skills should always apply now, even for skills you don't have yet. If any aren't working, let me know!
• Fixed the gold display on the level select screen
• Sprouts now drop experience, items, gold, health, and mana
• Fixed a cosmetic issue where monster health bars would only display as partially full if the area level changed before they rendered on screen. The health values were correct before, but the display % was broken due to a rather obscure event bug