New version: JACC v0.3.0

[JuliaRegistrator]

• Registering package: JACC
• Repository: https://github.com/JuliaORNL/JACC.jl
• Created by: @PhilipFackler
• Version: v0.3.0
• Commit: f82a48ba7eb62dc672a39dff4d7993021110fb5a
• Reviewed by: @PhilipFackler
• Reference: JuliaORNL/JACC.jl@f82a48b#commitcomment-153510014
• Description: CPU/GPU parallel performance portable layer in Julia via functions as arguments
• Release notes:

## Breaking changes

- Removed `JACCPreferences` module. Functionality remains. For example, use `JACC.set_backend(...)` instead of `JACC.JACCPreferences.set_backend(...)`

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