debug: xpcall entire program body, write crash log to .crash.log

Error is now saved to disk even if the window closes instantly.
Uses xpcall with debug.traceback for full stack trace.

inventoryManager.lua

@@ -15,6 +15,17 @@
 local _baseDir = fs.getDir(shell.getRunningProgram())
 local function _path(rel) return fs.combine(_baseDir, rel) end
 
+-- Write crash info to a file so we can always read it
+local function _crashLog(err)
+    local f = fs.open(_path(".crash.log"), "w")
+    if f then
+        f.write(tostring(err) .. "\n" .. (debug and debug.traceback and debug.traceback() or ""))
+        f.close()
+    end
+end
+
+local ok, err = xpcall(function()
+
 -- Override dofile to load modules into our _ENV so they inherit
 -- Opus's require/package (CC:Tweaked dofile uses _G instead).
 local _ccDofile = dofile
@@ -685,9 +696,16 @@ local function main()
     )
 end
 
-local ok, err = pcall(main)
+main()
+
+end, function(e) return tostring(e) .. "\n" .. debug.traceback() end)
+
 if not ok then
+    _crashLog(err)
     printError(tostring(err))
+    print("")
+    print("Crash log saved to: " .. _path(".crash.log"))
+    print("")
     print("Press any key to exit...")
-    os.pullEvent("key")
+    os.pullEvent("char")
 end