fix: encode svg to Base64, prevent build optimizer error (#901)

See
reworkcss/css#154
angular/angular-cli#20760
nrwl/nx#4381

Co-authored-by: Remo Loetscher <remo.loetscher@bison-group.com>

src/lib/toastr.css

@@ -113,19 +113,19 @@ button.toast-close-button {
 }
 /* https://github.com/FortAwesome/Font-Awesome-Pro/blob/master/advanced-options/raw-svg/regular/info-circle.svg */
 .toast-info {
-  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512' width='512' height='512'%3E%3Cpath fill='rgb(255,255,255)' d='M256 8C119.043 8 8 119.083 8 256c0 136.997 111.043 248 248 248s248-111.003 248-248C504 119.083 392.957 8 256 8zm0 110c23.196 0 42 18.804 42 42s-18.804 42-42 42-42-18.804-42-42 18.804-42 42-42zm56 254c0 6.627-5.373 12-12 12h-88c-6.627 0-12-5.373-12-12v-24c0-6.627 5.373-12 12-12h12v-64h-12c-6.627 0-12-5.373-12-12v-24c0-6.627 5.373-12 12-12h64c6.627 0 12 5.373 12 12v100h12c6.627 0 12 5.373 12 12v24z'/%3E%3C/svg%3E");
+  background-image: url("data:image/svg+xml;base64,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");
 }
 /* https://github.com/FortAwesome/Font-Awesome-Pro/blob/master/advanced-options/raw-svg/regular/times-circle.svg */
 .toast-error {
-  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512' width='512' height='512'%3E%3Cpath fill='rgb(255,255,255)' d='M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm121.6 313.1c4.7 4.7 4.7 12.3 0 17L338 377.6c-4.7 4.7-12.3 4.7-17 0L256 312l-65.1 65.6c-4.7 4.7-12.3 4.7-17 0L134.4 338c-4.7-4.7-4.7-12.3 0-17l65.6-65-65.6-65.1c-4.7-4.7-4.7-12.3 0-17l39.6-39.6c4.7-4.7 12.3-4.7 17 0l65 65.7 65.1-65.6c4.7-4.7 12.3-4.7 17 0l39.6 39.6c4.7 4.7 4.7 12.3 0 17L312 256l65.6 65.1z'/%3E%3C/svg%3E");
+  background-image: url("data:image/svg+xml;base64,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");
 }
 /* https://github.com/FortAwesome/Font-Awesome-Pro/blob/master/advanced-options/raw-svg/regular/check.svg */
 .toast-success {
-  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512' width='512' height='512'%3E%3Cpath fill='rgb(255,255,255)' d='M173.898 439.404l-166.4-166.4c-9.997-9.997-9.997-26.206 0-36.204l36.203-36.204c9.997-9.998 26.207-9.998 36.204 0L192 312.69 432.095 72.596c9.997-9.997 26.207-9.997 36.204 0l36.203 36.204c9.997 9.997 9.997 26.206 0 36.204l-294.4 294.401c-9.998 9.997-26.207 9.997-36.204-.001z'/%3E%3C/svg%3E");
+  background-image: url("data:image/svg+xml;base64,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");
 }
 /* https://github.com/FortAwesome/Font-Awesome-Pro/blob/master/advanced-options/raw-svg/regular/exclamation-triangle.svg */
 .toast-warning {
-  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 576 512' width='576' height='512'%3E%3Cpath fill='rgb(255,255,255)' d='M569.517 440.013C587.975 472.007 564.806 512 527.94 512H48.054c-36.937 0-59.999-40.055-41.577-71.987L246.423 23.985c18.467-32.009 64.72-31.951 83.154 0l239.94 416.028zM288 354c-25.405 0-46 20.595-46 46s20.595 46 46 46 46-20.595 46-46-20.595-46-46-46zm-43.673-165.346l7.418 136c.347 6.364 5.609 11.346 11.982 11.346h48.546c6.373 0 11.635-4.982 11.982-11.346l7.418-136c.375-6.874-5.098-12.654-11.982-12.654h-63.383c-6.884 0-12.356 5.78-11.981 12.654z'/%3E%3C/svg%3E");
+  background-image: url("data:image/svg+xml;base64,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");
 }
 .toast-container.toast-top-center .ngx-toastr,
 .toast-container.toast-bottom-center .ngx-toastr {