dependencies/devDependencies updates

- 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`

plugins/datatables-fixedheader/css/fixedHeader.bootstrap4.css

@@ -0,0 +1,20 @@
+table.dataTable.fixedHeader-floating,
+table.dataTable.fixedHeader-locked {
+  background-color: white;
+  margin-top: 0 !important;
+  margin-bottom: 0 !important;
+}
+
+table.dataTable.fixedHeader-floating {
+  position: fixed !important;
+}
+
+table.dataTable.fixedHeader-locked {
+  position: absolute !important;
+}
+
+@media print {
+  table.fixedHeader-floating {
+    display: none;
+  }
+}