Add bootstrap 4 support

[Radon8472]

Current Yii2 template uses bootstrap4 and so you get the error Failed to instantiate component or class "yii\bootstrap\BootstrapAsset".

You can change this in DataTableBootstrapAsset.php when you replace the line

$this->depends[] = 'yii\bootstrap\BootstrapAsset';

with

$this->depends[] = 'yii\bootstrap4\BootstrapAsset';

Unfortunalle there is no bootstrap 4 in @bower/datatables-plugins/integration/bootstrap and I the source repo of bower-asset/datatables-plugins seems to be removed or switched to private.

You should:

• find a way to load bootstrap 4 assets (either from newer version of "bower-asset/datatables-plugins" of another source) - e.g. bower-asset/datatables.net-bs4
• Add a switch into DataTableBootstrapAsset that checks if the current yii uses bootstrap4 or older and depending on the result choose from wich namespace "BootstrapAsset" dependecy is set

[ZAYEC77]

I'm not sure that we have free cycles for this right now @Radon8472 feel free to create PR 🙏

[Radon8472]

I'm not sure that we have free cycles for this right now @Radon8472 feel free to create PR 🙏

I already tested some possible solutions, I try to create a PR over the next weekend

[Radon8472]

@ZAYEC77 Pull Request is created see #67