Port django CMS 4 features

[yakky]

Description

Port changes from support/4.x.0 branch and #70 to latest develop

References

Fix #82

Checklist

• [x] I have read the contribution guide
• [x] Code lint checked via inv lint
• [x] changes file included (see docs)
• [ ] Usage documentation added in case of new features
• [ ] Tests added

[coveralls]

Coverage: 100.0%. Remained the same when pulling 55dbdac77f6f52344ef5da4aa6e38de4e59740b0 on feature/issue-82-djangocms-4 into 54aab9a7d3e79b0264cb764d8e9d01e83e0bcf18 on develop.

[codecov[bot]]

Codecov Report

Patch coverage: 95.45% and project coverage change: -1.08 :warning:

Comparison is base (54aab9a) 100.00% compared to head (55dbdac) 98.92%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #83 +/- ## =========================================== - Coverage 100.00% 98.92% -1.08% =========================================== Files 9 9 Lines 152 186 +34 Branches 19 24 +5 =========================================== + Hits 152 184 +32 - Partials 0 2 +2 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `98.38% <93.18%> (-1.62%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://app.codecov.io/gh/nephila/djangocms-page-sitemap/pull/83?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila) | Coverage Δ | | |---|---|---| | [djangocms\_page\_sitemap/models.py](https://app.codecov.io/gh/nephila/djangocms-page-sitemap/pull/83?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila#diff-ZGphbmdvY21zX3BhZ2Vfc2l0ZW1hcC9tb2RlbHMucHk=) | `100.00% <ø> (ø)` | | | [djangocms\_page\_sitemap/sitemap.py](https://app.codecov.io/gh/nephila/djangocms-page-sitemap/pull/83?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila#diff-ZGphbmdvY21zX3BhZ2Vfc2l0ZW1hcC9zaXRlbWFwLnB5) | `96.29% <92.85%> (-3.71%)` | :arrow_down: | | [djangocms\_page\_sitemap/cms\_toolbars.py](https://app.codecov.io/gh/nephila/djangocms-page-sitemap/pull/83?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila#diff-ZGphbmdvY21zX3BhZ2Vfc2l0ZW1hcC9jbXNfdG9vbGJhcnMucHk=) | `100.00% <100.00%> (ø)` | | | [djangocms\_page\_sitemap/utils.py](https://app.codecov.io/gh/nephila/djangocms-page-sitemap/pull/83?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila#diff-ZGphbmdvY21zX3BhZ2Vfc2l0ZW1hcC91dGlscy5weQ==) | `100.00% <100.00%> (ø)` | |

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