* Optional `optionals` in `get_attrs!`

* Improve `get_attrs`

* Improve Map error

* Simplify `parse_tag` internals

* Warn on missing docs

* Add some documentation and fix examples

* More documentation

* More docs

* More docs

* Fix object colour docs

* Finish documenting

* Misc changes

* Address PR comment

* Add attributes
- `#[inline]` for properties
- `#![deny(unsafe_code)]`
- `#![deny(missing_copy_implementations)]`
- `#![deny(missing_debug_implementations)]`

* Add more inline attributes

* Merge with upstream

* Move `parse_animation` to the `animation` module

* Simplify `parse_data_line`

* Simplify tile layer utils

* Simplify `convert_to_tiles`

* Simplify objects module

* Simplify if

* Address PR comments