909 Update LoadImage to use Nibabel as default

[Nic-Ma]

Partly fixes issue #909 .

Description

This PR implemented below features:
Change the default reader of LoadImage to Nibabel.
Add string support for the reader parameter.
Update all the examples and tutorials to use LoadImage transform.

Status

Ready

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• Integration tests passed locally by running ./runtests.sh --codeformat --coverage.
• Quick tests passed locally by running ./runtests.sh --quick.
• In-line docstrings updated.
• Documentation updated, tested make html command in the docs/ folder.

[Nic-Ma]

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[Nic-Ma]

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[Nic-Ma]

Hi @wyli ,

Thanks for your review, I updated the PR according to your comments.
Could you please help review again?
We will try to update all the examples and tutorials when this PR is ready.

Thanks.

[Nic-Ma]

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[Nic-Ma]

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[Nic-Ma]

Hi @wyli ,

I updated the PR to automatically select the default reader based on image type.
Could you please help review it again?

Thanks.

[Nic-Ma]

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[wyli]

thanks I put some minor suggestions of using self.register

[Nic-Ma]

/integration-test /black

[Nic-Ma]

Hi @wyli .

Thanks for your suggestions, I updated the PR according to your comments.
Could you please help review it again?

Thanks.

[Nic-Ma]

/integration-test /black

[wyli]

thanks, all tests upgraded to use the new API and tests work fine

[Nic-Ma]

Thanks for your update, I will try to update examples and tutorials soon.