- Fix typo in `placeholderRednerField` → `placeholderRenderField`
- Validate `converterField` as string type

Requires a Odoo with [ADD] *: pypdf 3.x compatibility (https://github.com/odoo/odoo/commit/fddf53c9b6bcaea1a9ff7e041c0ccbb65a4647c8)

Reuse odoo guess mimetype code and compatibility code between different versions of python-magic.

Also factorize some code and add comment.

- Introduced a button to dynamically set the expression in the substitution line.
- The feature is available for converters of type "Odoo template", "Odoo template + Evaluation", and "Field".
- Added functionality to visualize how to define each converter, displaying a placeholder (example) for each converter type.
- The code has been designed to ease the integration of additional converters in the future.
- Refactored the code to improve performance and stability.

- Add missing python-magic requirement for package

- Added `ormcache` to improve performance by caching template retrieval
in `_get_cached_template`.
- Refactored template processing logic:
  - Introduced `_to_odoo_template` to centralize transformation
    of external templates into Odoo-compatible format.
  - Simplified template computation in `_compute_template` and
    `_compute_template_data` using cached templates.
- Removed redundant methods (`to_cache`) and consolidated logic for clarity.

- Added python-magic to external dependencies in __manifest__.py
- Fixed metadata formatting for print-paper-size in ir_actions_report.py

Renamed `find_field_with_sort_order` to `parse_sorted_field`.

- Updated the `find_field_with_sort_order` function to return
`(expression, None)` when the regex doesn't match.
- This provides clearer feedback by preserving the original expression.

Note that we implemented sorting functionality and added unit tests.

The changes include:

- Creation of a new utility file `utils/sorting.py` implementing sorting
functionalities such as :
`find_field_with_sort_order`,
`parse_fields_with_sort_directions`, and `sortkey`.
- Addition of a new file `tests/test_sorting.py` containing unit tests for
sorting logic.

& latest xcg/templates/odoo_module.

converter backport in 2021-06.
In particular, add "HTML + mustache" / "MJML + mustache" instead of just "mustache".

add /api/v1 in the code.