* refactor: Remove uses of AnyDuringMigration from xml.ts.
* refactor: Remove uses of AnyDuringMigration from block_svg.ts.
* refactor: Remove uses of AnyDuringMigration from theme_manager.ts.
* refactor: Remove uses of AnyDuringMigration from names.ts.
* refactor: Remove uses of AnyDuringMigration from field_angle.ts.
* refactor: Remove some uses of AnyDuringMigration from block.ts.
* refactor: Make safename construction more readable.
* fix: Use a default size for block comments.
* fix: Clarify test of shadow block disposal.
* fix: Update assert in workspace_svg_test to use isDeadOrDying().