ref: one codebase for hover tooltip and freezed tooltip

- rename variables for URL template, use templateSrv to render URL links
- fix visibility of tooltip items and url template help popup whe the light theme is used
- rework Tooltip settings pane, organize tooltip editor fields
- rename properties in panel config, implement migration logic for legacy configuration
- close button for the frozen tooltip
- use relative positioning for proper page scrolling

package.json

@@ -5,7 +5,8 @@
   "main": "README.md",
   "scripts": {
     "build": "grunt",
-    "check-types": "node_modules/typescript/bin/tsc"
+    "check-types": "node_modules/typescript/bin/tsc",
+    "test": "jest"
   },
   "author": "Flant JSC",
   "license": "Apache-2.0",
@@ -26,6 +27,7 @@
     "@types/d3-scale-chromatic": "1.3.1",
     "@types/angular": "1.6.56",
     "@types/grafana": "github:flant/types-grafana",
+    "@types/jest": "24.0.13",
     "@types/jquery": "1.10.35",
     "@types/lodash": "4.14.123",
     "babel-core": "7.0.0-bridge.0",
@@ -43,8 +45,12 @@
     "grunt-contrib-uglify": "^3.0.1",
     "grunt-contrib-watch": "^1.0.0",
     "grunt-notify": "^0.4.5",
+    "jest": "24.8.0",
+    "jest-canvas-mock": "2.1.2",
+    "jest-date-mock": "1.0.7",
     "load-grunt-tasks": "^3.5.2",
     "typescript": "3.7.2",
+    "ts-jest": "24.1.0",
     "tslib": "1.10.0"
   },
   "dependencies": {