Added an orbit cam using Dolly to the Scene Viewer

[apps4uco]

Checklist

• CI Checked:
  • [x ] cargo fmt has been ran
  • cargo clippy reports no issues

  Checking bimap v0.6.3
error: incorrect implementation of `clone` on a `Copy` type
  --> rend3-types/src/lib.rs:59:29
   |
59 |       fn clone(&self) -> Self {
   |  _____________________________^
60 | |         Self {
61 | |             idx: self.idx,
62 | |             _phantom: PhantomData,
63 | |         }
64 | |     }
   | |_____^ help: change this to: `{ *self }`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incorrect_clone_impl_on_copy_type
   = note: `#[deny(clippy::incorrect_clone_impl_on_copy_type)]` on by default

• cargo test succeeds
• cargo rend3-doc has no warnings
• cargo deny check issues have been fixed or added to deny.toml

warning[unmatched-skip-root]: skip tree root was not found in the dependency graph
   ┌─ /Users/andy/rust/rend3d/rend3/deny.toml:29:5
   │
29 │     { name = "loom", version = "0.5" },
   │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ no crate matched these criteria

warning[license-not-encountered]: license was not encountered
  ┌─ /Users/andy/rust/rend3d/rend3/deny.toml:4:42
  │
4 │ allow = ["Apache-2.0", "MIT", "MPL-2.0", "LicenseRef-UFL-1.0", "Unlicense"]
  │                                          ^^^^^^^^^^^^^^^^^^^^ unmatched license allowance

• Manually Checked:
  • relevant examples/test cases run
  • changes added to changelog
    • Add credit to yourself for each change: Added new functionality @githubname.
    • [ ]

Suggestion: 
Added an orbit cam using the Dolly crate to the Scene Viewer @apps4uco

Related Issues

#307

Description

Added an orbit cam using Dolly to the Scene Viewer @apps4uco.

Keys:

W Forward
S Back
A Left
D Right
Q Up
Z Down

Note: Mouse movement is supported but a bit jerky

Tested with default sample and https://github.com/KhronosGroup/glTF-Sample-Models/tree/master/2.0/ABeautifulGame

[cwfitzgerald]

This is awesome! Might take me a day or so to review this, but I've wanted to integrate dolly for a while!

[apps4uco]

By the way I am happy to work on this functionality more e.g.: to implement other types of cameras
if you would like.

[cwfitzgerald]

Sorry for the massive delay in getting back to this.

This is a good first start! It's actually not a bad way of navigating. My thoughts so far:

• It would be nice if wasdqz still moved the center of the camera, and mouse + mousewheel did orbit size. I think that would be a more natural way to explore spaces
• The sensitivity of the mouse seems way high