utilize odin test -all-packages instead of (make/bat) scripts for running tests

tests/core/download_assets.py

@@ -8,7 +8,7 @@ import hashlib
 import hmac
 
 TEST_SUITES        = ['PNG', 'XML', 'BMP']
-DOWNLOAD_BASE_PATH = "assets/{}"
+DOWNLOAD_BASE_PATH = sys.argv[1] + "/{}"
 ASSETS_BASE_URL    = "https://raw.githubusercontent.com/odin-lang/test-assets/master/{}/{}"
 HMAC_KEY           = "https://odin-lang.org"
 HMAC_HASH          = hashlib.sha3_512
@@ -352,4 +352,4 @@ def main():
 	return 0
 
 if __name__ == '__main__':
-	sys.exit(main())
+	sys.exit(main())