Introduce new TreeView UI component

Key highlights:

- Written from scratch to cater specifically to privacy.sexy's
  needs and requirements.
- The visual look mimics the previous component with minimal changes,
  but its internal code is completely rewritten.
- Lays groundwork for future functionalities like the "expand all"
  button a flat view mode as discussed in #158.
- Facilitates the transition to Vue 3 by omitting the Vue 2.0 dependent
  `liquour-tree` as part of #230.

Improvements and features:

- Caching for quicker node queries.
- Gradual rendering of nodes that introduces a noticable boost in
  performance, particularly during search/filtering.
  - `TreeView` solely governs the check states of branch nodes.

Changes:

- Keyboard interactions now alter the background color to highlight the
  focused item. Previously, it was changing the color of the text.
- Better state management with clear separation of concerns:
  - `TreeView` exclusively manages indeterminate states.
  - `TreeView` solely governs the check states of branch nodes.
  - Introduce transaction pattern to update state in batches to minimize
    amount of events handled.
- Improve keyboard focus, style background instead of foreground. Use
  hover/touch color on keyboard focus.
- `SelectableTree` has been removed. Instead, `TreeView` is now directly
  integrated with `ScriptsTree`.
- `ScriptsTree` has been refactored to incorporate hooks for clearer
  code and separation of duties.
- Adopt Vue-idiomatic bindings instead of keeping a reference of the
  tree component.
- Simplify and change filter event management.
- Abandon global styles in favor of class-scoped styles.
- Use global mixins with descriptive names to clarify indended
  functionality.

package-lock.json

@@ -19,7 +19,6 @@
         "cross-fetch": "^4.0.0",
         "electron-progressbar": "^2.1.0",
         "file-saver": "^2.0.5",
-        "liquor-tree": "^0.2.70",
         "markdown-it": "^13.0.1",
         "npm": "^9.8.1",
         "v-tooltip": "2.1.3",
@@ -10762,11 +10761,6 @@
         "uc.micro": "^1.0.1"
       }
     },
-    "node_modules/liquor-tree": {
-      "version": "0.2.70",
-      "resolved": "https://registry.npmjs.org/liquor-tree/-/liquor-tree-0.2.70.tgz",
-      "integrity": "sha512-5CiMlDVmuveYwwc27mYe1xZ3J4aHhZBErUhIp9ov4v4wIBso+s5JAByOOit4iOCMCQ5ODd8VggbKymzZREYbBQ=="
-    },
     "node_modules/listr2": {
       "version": "3.14.0",
       "resolved": "https://registry.npmjs.org/listr2/-/listr2-3.14.0.tgz",
@@ -29242,11 +29236,6 @@
         "uc.micro": "^1.0.1"
       }
     },
-    "liquor-tree": {
-      "version": "0.2.70",
-      "resolved": "https://registry.npmjs.org/liquor-tree/-/liquor-tree-0.2.70.tgz",
-      "integrity": "sha512-5CiMlDVmuveYwwc27mYe1xZ3J4aHhZBErUhIp9ov4v4wIBso+s5JAByOOit4iOCMCQ5ODd8VggbKymzZREYbBQ=="
-    },
     "listr2": {
       "version": "3.14.0",
       "resolved": "https://registry.npmjs.org/listr2/-/listr2-3.14.0.tgz",