Servo Greeter

Heads up! This PR modifies the following files: * @asajeffrey: components/script/dom/bindings/codegen/CodegenRust.py, components/script/dom/document.rs, components/script/script_module.rs, components/script/dom/eventtarget.rs, components/script/dom/htmlscriptelement.rs and 9 more * @kichjang: components/script/dom/bindings/codegen/CodegenRust.py, components/script/dom/document.rs, components/script/script_module.rs, components/script/dom/eventtarget.rs, components/script/dom/htmlscriptelement.rs and 9 more

**Warning** * These commits modify **unsafe code**. Please review it carefully! * These commits modify script code, but no tests are modified. Please consider adding a test!

Heads up! This PR modifies the following files: * @asajeffrey: components/script/canvas_state.rs, components/script/dom/xrreferencespace.rs, components/script/dom/gpudevice.rs, components/script/dom/xrviewerpose.rs, components/script/dom/xrview.rs and 12 more * @cbrewster: components/constellation/Cargo.toml, components/constellation/constellation.rs * @jgraham: components/webdriver_server/Cargo.toml * @kichjang: components/script/canvas_state.rs, components/script/dom/xrreferencespace.rs, components/script/dom/gpudevice.rs,...

**Warning** * These commits modify **unsafe code**. Please review it carefully!

Thanks for the pull request, and welcome! The Servo team is excited to review your changes, and you should hear from @manishearth (or someone else) soon.

Heads up! This PR modifies the following files: * @asajeffrey: components/script/dom/webidls/StaticRange.webidl, components/script/dom/mod.rs, components/script/dom/webidls/AbstractRange.webidl, components/script/dom/webidls/Range.webidl, components/script/dom/range.rs and 3 more * @kichjang: components/script/dom/webidls/StaticRange.webidl, components/script/dom/mod.rs, components/script/dom/webidls/AbstractRange.webidl, components/script/dom/webidls/Range.webidl, components/script/dom/range.rs and 3 more

Heads up! This PR modifies the following files: * @asajeffrey: components/script/dom/webidls/WebGL2RenderingContext.webidl, components/script/dom/webglframebuffer.rs, components/script/dom/webgl2renderingcontext.rs * @kichjang: components/script/dom/webidls/WebGL2RenderingContext.webidl, components/script/dom/webglframebuffer.rs, components/script/dom/webgl2renderingcontext.rs

Heads up! This PR modifies the following files: * @asajeffrey: components/script/Cargo.toml * @kichjang: components/script/Cargo.toml

**Warning** * These commits modify script code, but no tests are modified. Please consider adding a test!

Thanks for the pull request, and welcome! The Servo team is excited to review your changes, and you should hear from @asajeffrey (or someone else) soon.