Simple map load/save

Signed-off-by: serengeor <serengeor@gmail.com>
Signed-off-by: serengeor <serengeor@gmail.com>
Merge branch 'tile_editor' into map_serialize
Merge branch 'tile_editor' into map_serialize
Merge branch 'sprite_selector' into tile_editor
Signed-off-by: serengeor <serengeor@gmail.com>
Merge branch 'tile_editor' of https://github.com/serengeor/And-they-shall-know-no-fear into tile_editor
Merge branch 'map_serialize' into tile_editor