tmx_converter.py support for new naming
some names changed in version 1.7.0+ (no clue if tiles makes this or was done by hand but the fact that all maps above 1.7.0 have this is most likely a tiled thing)
eA_death --> death
eA_spawn --> spawn
dest_tile_x --> dest_x
dest_tile_y --> dest_y
both versions are supported with this.
version 1.9.0+ moved from type to class (for example: type="spawn" --> class="spawn")
both versions are supported with this.