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[ADD] util.fields: handle ir.exports model/fields renames/removal

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Properly handle ir.exports, especially on model/fields removal. See commits for additional details.

[REF] util.views: refactor converter code, regroup views helpers

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Overview of changes (see commits for details): - refactored BootstrapConverter code, separating conversion code and operations from bootstrap-specific code. This way other kind of converters can be implemented, reusing pre-defined...

feat!: migration to v9 api version (tests passing)

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Additions to #303 with v9 migration fixes and all tests passing.