Bevy 0.16 support

[ickylizardcolin]

As of writing this post, the readme says:

Bevy Version	Crates Version
0.14.0	0.5.0
0.13.0	0.4.0
0.12.0	0.3.0
0.11.0	0.2.0
0.10.0	0.1.6
0.9.0	0.1.5

Can support be added up to Bevy 0.16?

[ickylizardcolin]

also ive been doing a little work myself here