Add Bootstrap v4.x support

[giterlizzi]

The next major release of template will be include Bootstrap v4 and Bootswatch v4 templates.

• Add initial support of Bootstrap v4 utilities using a Bootstrap v3 backport (see below)
• Remove most of custom CSS style (in template.less, plugin.less, etc) and use Bootstrap v4 utilities
• Import all Bootstrap v4 and Bootswatch v4 assets
• Follow the Migration guide https://getbootstrap.com/docs/4.3/migration/
• Test all template & plugin functionalities
• ....

bs4-utilities.scss

/*!
 * Bootstrap v4 utilities backport for Bootstrap v3
 * 
 * Copyright 2019 Giuseppe Di Terlizzi <giuseppe.diterlizzi@gmail.com>
 * Copyright 2011-2019 The Bootstrap Authors
 * Copyright 2011-2019 Twitter, Inc.
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
 */

@import "functions";
@import "variables";
@import "mixins";

@import "utilities/align";
@import "utilities/borders";
@import "utilities/clearfix";
@import "utilities/display";
@import "utilities/embed";
@import "utilities/flex";
@import "utilities/float";
@import "utilities/overflow";
@import "utilities/position";
@import "utilities/screenreaders";
@import "utilities/shadows";
@import "utilities/sizing";
@import "utilities/spacing";
@import "utilities/visibility";

[fibinicci]

Hello, I am very interested in your Bootsrap V4 project.
I use the current V3 and wanted to use "cards" like in gerardnico.com bootie template but unfortunately they seem to belong to V4 only.
Do you foressee to have it enabled in V4? Any idea when? :-)
Sorry am not a coder, if not I would have contributed.

[atiq4pk]

Hello, Your bootstrap3 template is awesome. Now waiting for your next awesome work for v4. I am anxiously waiting for it. As I am not coder so I cannot help in this regards, but I can support your project a little bit.

[Hitch42]

It is possible for you announce your potential timetable for having Bootstrap 4 support? I think your Dokuwiki template is the best one that suits my needs, but I would like to take advantage of Bootstrap 4 features. I want to know if I should wait for your upgrade or perhaps search for a different solution if you do not plan on working on it any time soon. Thank you.

[TheZachh]

I assume this has been abandoned, but I hope it comes soon. The current version of bootstrap is ancient and buggy.

[giterlizzi]

The porting to BS 4 still in progress.
Is not easy because more BS4 component are different (eg. Panel --> Card) or deprecated/dropped (https://getbootstrap.com/docs/4.0/migration).

[friedrico]

why not directly jumping to 5?
https://getbootstrap.com/docs/5.1/migration/

[FelipoAntonoff]

Hello, I really think it would be more interesting to go to Bootstrap 5.2 - https://getbootstrap.com/docs/5.2/getting-started/introduction/

Interesting that now it doesn't use Jquery but JS vanilla.

[secondtruth]

Are there any news on this? Especially Bootstrap 5 support would be very cool and would bring compatibility with the newest Bootswatch themes.