Release v0.5.0

[mkeeter]

It's not a perfectly clean break (there are a bunch of fidget_wgpu things remaining to be done), but the changelog has piled up to an alarming length.

[Copilot]

Pull request overview

This PR prepares the repository for the v0.5.0 release by bumping crate versions across the workspace and updating the changelog and lockfiles to reflect the new release.

Changes:

• Bump all fidget* crate versions from 0.4.4 to 0.5.0.
• Update workspace dependency pins in the root Cargo.toml to =0.5.0.
• Refresh Cargo.lock files and update CHANGELOG.md for the 0.5.0 release notes.

Reviewed changes

Copilot reviewed 13 out of 15 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
fidget/Cargo.toml	Bump fidget crate version to 0.5.0.
fidget-wgpu/Cargo.toml	Bump fidget-wgpu crate version to 0.5.0.
fidget-solver/Cargo.toml	Bump fidget-solver crate version to 0.5.0.
fidget-shapes/Cargo.toml	Bump fidget-shapes crate version to 0.5.0.
fidget-rhai/Cargo.toml	Bump fidget-rhai crate version to 0.5.0.
fidget-raster/Cargo.toml	Bump fidget-raster crate version to 0.5.0.
fidget-mesh/Cargo.toml	Bump fidget-mesh crate version to 0.5.0.
fidget-jit/Cargo.toml	Bump fidget-jit crate version to 0.5.0.
fidget-gui/Cargo.toml	Bump fidget-gui crate version to 0.5.0.
fidget-core/Cargo.toml	Bump fidget-core crate version to 0.5.0.
fidget-bytecode/Cargo.toml	Bump fidget-bytecode crate version to 0.5.0.
demos/web-editor/crate/Cargo.lock	Update demo lockfile to reference v0.5.0 workspace crates.
CHANGELOG.md	Add 0.5.0 release notes and adjust wording for fidget-wgpu.
Cargo.toml	Update workspace dependency pins to =0.5.0 for local crates.
Cargo.lock	Update workspace lockfile to reference v0.5.0 workspace crates.

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