feat(bootstrap): update nebular/bootstrap to Eva (#1507)

BREAKING CHANGES:
Bootstrap checkbox and radio are removed now, use Nebular Checkbox and Nebular Radio with better theming support.

package.json

@@ -121,6 +121,7 @@
  "@angular/cli": "8.0.0-rc.2",
  "@angular/compiler-cli": "8.0.0-rc.2",
  "@angular/language-service": "8.0.0-rc.2",
+ "@ng-bootstrap/ng-bootstrap": "^4.1.3",
  "@schematics/angular": "^8.0.0-rc.2",
  "@types/gulp": "3.8.36",
  "@types/highlight.js": "9.12.2",

src/framework/bootstrap/styles/_button-group.scss

@@ -4,7 +4,7 @@
  * Licensed under the MIT License. See License.txt in the project root for license information.
  */
 
-@import 'default-buttons';
+@import 'status-buttons';
 
 @mixin btn-group-primary-separator() {
  @include nb-theme(color-primary-600);

src/framework/bootstrap/styles/_buttons.scss

@@ -6,40 +6,32 @@
 
 @import 'shape-buttons';
 @import 'size-buttons';
-@import 'default-buttons';
+@import 'status-buttons';
 @import 'hero-buttons';
 @import 'outline-buttons';
 
 @mixin nb-b-buttons-theme() {
 
  .btn {
- color: nb-theme(btn-fg);
- text-transform: uppercase;
- letter-spacing: 0.4px;
- font-weight: nb-theme(font-weight-bolder);
- font-family: nb-theme(btn-font-family);
- border: 2px solid transparent;
- transition: none;
- cursor: nb-theme(btn-cursor);
+ cursor: nb-theme(button-cursor);
+ font-family: nb-theme(button-text-font-family);
+ font-weight: nb-theme(button-text-font-weight);
 
- &:focus, .focus,
- &:hover, .hover,
- &:active, .active {
- color: nb-theme(btn-fg);
- cursor: nb-theme(btn-cursor);
+ &:focus {
+ box-shadow: 0 0 0 nb-theme(button-outline-width) nb-theme(button-outline-color);
+ outline: none;
  }
 
- &:not(:disabled):not(.disabled) {
- cursor: nb-theme(btn-cursor);
+ &[disabled] {
+ cursor: nb-theme(button-disabled-cursor);
  }
 
- @include btn-md();
+ @include b-btn-size(medium);
  }
 
- @include btn-shape();
- @include btn-size();
-
- @include btn-default();
- @include btn-hero();
- @include btn-outline();
+ @include b-btn-shapes();
+ @include b-btn-sizes();
+ @include b-btn-statuses();
+ @include b-btn-heros();
+ @include b-btn-outlines();
 }