cleanup: QOL improvements — gitignore, Tags constants, remove debug artifacts

- Add .DS_Store, unused/, .vscode/settings.json to .gitignore
- Add .editorconfig (tabs for Lua, LF, UTF-8)
- Fix duplicate submodule entry in .gitmodules
- Add Tags table (player, tank, ground, granade, ammoCrate) — replace magic numbers
- Add SCREEN_W/SCREEN_H constants
- Fix leaked global variable `c` in Game.lua
- Remove Noble.showFPS = true from BomberScene
- Remove debug print() calls from granade, enemy, BomberScene
- Fix clean_build_dir glob bug in both build scripts
- Make PLAYDATE_SDK_PATH configurable via env var

source/scripts/bomber/ammoCrate.lua

@@ -11,7 +11,7 @@ function AmmoCrate:init(x, y)
     self:setGroups(CollideGroups.props)
     self:setCollidesWithGroups({ CollideGroups.granade })
     self:setCollideRect(0, 0, self.crateSize, self.crateSize)
-    self:setTag(155)
+    self:setTag(Tags.ammoCrate)
 
     self.removed = false
     self.bonusGrenades = 3
@@ -30,7 +30,7 @@ function AmmoCrate:update()
     local _, _, collisions, count = self:checkCollisions(self.x, self.y)
     if count > 0 then
         for i, collision in ipairs(collisions) do
-            if collision.other:getTag() == 154 and collision.other.currentRadius <= 0.05 then
+            if collision.other:getTag() == Tags.granade and collision.other.currentRadius <= 0.05 then
                 self:pickup()
                 return
             end