further changes for v3.0.0-rc.1

- added dropdown-hover for "Hover for action" in layout/top-nav
- changed bootstrap modal info text in UI/modals
- updated vertical tabs examples for a better mobile view

- updated package.json
- updated build/npm/Plugins.js
- updated pages/gallery.html

- moved control sidebar related functions from Layout.js to ControlSidebar.js
- added own scrollbar options
- added ability to set control sidebar height while scrolling
- fixed overlapping with fixed footer/navbar

- fixed javascript/card-widget
- added new deps in dependencies

- updated dependencies
  - `@fortawesome/fontawesome-free` to 5.10.2
  - `@fullcalendar/bootstrap` to 4.3.0
  - `@fullcalendar/core` to 4.3.1
  - `@fullcalendar/daygrid` to 4.3.0
  - `@fullcalendar/interaction` to 4.3.0
  - `@fullcalendar/timegrid` to 4.3.0
  - `bootstrap-slider` to 10.6.2
  - `flot` to 3.2.9
  - `overlayscrollbars` to 1.9.1
  - `raphael` to 2.3.0
  - `select2` to 4.0.10
  - `sweetalert2` to 8.16.3
- replaced dependencies
  - `jqvmap` with `jqvmap-novulnerability` (removes git requirement on `npm i`)
- added new dependencies
  - `datatables.net-autofill-bs4` to 2.3.3
  - `datatables.net-bs4` to 1.10.19
  - `datatables.net-buttons-bs4` to 1.5.6
  - `datatables.net-colreorder-bs4` to 1.5.1
  - `datatables.net-fixedcolumns-bs4` to 3.2.6
  - `datatables.net-fixedheader-bs4` to 3.1.5
  - `datatables.net-keytable-bs4` to 2.5.0
  - `datatables.net-responsive-bs4` to 2.2.3
  - `datatables.net-rowgroup-bs4` to 1.1.0
  - `datatables.net-rowreorder-bs4` to 1.2.5
  - `datatables.net-scroller-bs4` to 2.0.0
  - `datatables.net-select-bs4` to 1.3.0
  - `jszip` to 3.2.2
  - `pdfmake` to 0.1.58
- updated devDependencies
  - `@babel/cli` to 7.5.5
  - `@babel/core` to 7.5.5
  - `@babel/preset-env` to 7.5.5
  - `css-loader` to 3.2.0
  - `rollup"` to .20.2
  - `terser` to 4.2.1
- removed old plugins
  - `morris`

- added filterizr to plugins
- created gallery demo

- fixed timeline link in pages/calendar & pages/widgets
- added ribbons link after timeline link

- added btn-xs class
- added btn-xs demo in pages/UI/buttons.html
- enhanced dropdown-hover for button dropdowns
- fixed dropdown examples in pages/UI/buttons.html

- added Dropdown.js
- added .dropdown-submenu
- added .dropdown-hover
- added dropdown example & fixed card headers in pages/layout/top-nav.html

- removed box-shadow from custom form element #2200
- updated pages/forms/general.html (splited general and custom elements)
- fixed focus on custom switch & range

- added abilty to use a .right container instead of two single items
- added nav-compact for reduced paddings

- reduced title font size
- changed title & tools margins/paddings

typo fix on 'yarn add'

first changes to v3.0.0-rc.1

Migration the timeline component to "bootstrap 4".