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

build_and_run_mac.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-export PLAYDATE_SDK_PATH="/Users/oleksiiilienko/Developer/PlaydateSDK"
+export PLAYDATE_SDK_PATH="${PLAYDATE_SDK_PATH:-/Users/oleksiiilienko/Developer/PlaydateSDK}"
 
 # Check for color by variable and tput command
 if [[ -z $NOCOLOR && -n $(command -v tput) ]]; then
@@ -103,7 +103,7 @@ function make_build_dir() {
 function clean_build_dir() {
     if [[ -d "${BUILD_DIR}" ]]; then
         log "Cleaning build directory..."
-        rm -rfv "${BUILD_DIR}/*"
+        rm -rfv "${BUILD_DIR}"/*
         chk_err
     fi
 }