Refactor to keep from keeping a pointer to the host during async Tank calls.
Update README.md

Updating links.
Use ShellExecuteEx rather than boost::process on Windows to get proper shell environment.
#22243 Updated to try shotgun command first then fall back to tank.
Tank rename.
Rev to v0.0.3
Update README.md
Merge commit '58730f3a5938e637bb5f3911e3d4c4f11d0a4f27' into develop
Merge branch 'release/v0.0.3'