After upgrade to 6.4 and search do you see any issues?What delay you are noticing?

One reason it happens is- the user with which AEM is running (has been started by) does not have proper rights in OS

By Default, Anonymous user will not have permission /etc/tagsEither you can provide permission or read this via service user which as permission

You can use the template editor to create your own template for XF.It allows you to define clientlibs for template without writing any code.https://helpx.adobe.com/experience-manager/6-4/sites/authoring/using/templates.html

Technically CF is also of type asset.Main idea is to create content which can be reused and independent of design.Since you already have an image in DAM, putting it inside CF and then using it- I don't see how it helps.

There is no official documentation or steps released to do this.But you can try to look at OOTB one and do it. I don't think it will be straight forward.

you can use data-sly-attribute​https://github.com/Adobe-Marketing-Cloud/htl-spec/blob/master/SPECIFICATION.md#223-attribute

Maven version seems to be old.Can you try with version 3.5.4 or greater than 3.3

AFAIK, it does not provide you option to search the way https://datatables.net/  doesYou can look https://datatables.net/ as an alternative.Table: https://helpx.adobe.com/experience-manager/6-3/sites/developing/using/reference-materials/granite-ui/api/jcr_root/libs/granite/ui/components/coral/founda...

Are you saying, even if you manually try to install its not working?