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Rename ScriptRuntime to ScriptContext

Description

Rename ScriptRuntime to ScriptContext

SM52 essentially replaces JSRuntime with JSContext (though JSContext itself was replaced with JSCompartment).
To prepare for this migration, rename all Runtime-related things to Context.

Part of the SM52 migration, stage: SM45 compatible.

Patch by: Itms

Refs #4893

Differential Revision: https://code.wildfiregames.com/D3091