* refactor: Convert objects to sets and maps
* refactor: Use maps instead of objects in workspace.ts.
* refactor: Use maps instead of objects in theme_manager.ts.
* refactor: Use maps instead of objects in block_svg.ts.
* refactor: Use sets instead of objects in variables.ts.
* refactor: Use maps instead of objects in marker_manager.ts.
* refactor: Use maps instead of objects in touch_gesture.ts.
* refactor: Use maps instead of objects in variable_map.ts.
* refactor: Use maps and sets instead of objects in path_object.ts.
* refactor: Use maps instead of objects in shortcut_registry.ts.
* refactor: Use a map instead of an object in workspace_audio.ts.
* refactor: Use better ivar names and enforce the singleton ShortcutRegistry object and type.
* refactor: Use public API in the shortcut registry test.
* refactor: Simplify implementation of getAllVariableNames().
* refactor: Remove unnecessary emptiness check in block_svg.ts.
* fix: clang-format variable_map.ts.
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