Add initial implementation for AscAssetManager module

This commit introduces the following key features:

- **New `.gitignore`**:
  - Ignores `.vscode`, `.eslintrc.js`, and `dist/module.zip`.

- **Core functionality**:
  - Created `src/main.js` to implement the `AscAssetManager` class with methods to manage file uploads, categories, tags, and settings registration.
  - Introduced hooks for rendering and managing custom upload dialogs and forms.

- **Configuration and settings**:
  - Added `src/settings.js` to register settings for features like enabling/disabling, root directory configuration, and theme selection.

- **Templates**:
  - Added `upload-choose.hbs` for the file selection dialog.
  - Added `upload-form.hbs` for the file metadata customization dialog.

- **Utilities**:
  - Added `src/utils.js` with helper functions for file parsing, metadata handling, and filename creation.

- **Styling**:
  - Added `style.css` for styling upload areas.

- **Module metadata**:
  - Added `module.json` with module details, compatibility, and dependencies.

This commit establishes the foundational structure and functionality for the AscAssetManager module.

src/utils.js

@@ -0,0 +1,58 @@
+export function getFileExtension (fileName) {
+  const regex = new RegExp('[^.]+$');
+  return fileName.match(regex)?.[0];
+}
+export function getFileBasename (fileName) {
+  const regex = new RegExp('^[^.]+');
+  return fileName.match(regex)?.[0]
+}
+
+export function parseFileName (s) {
+  const pattern = /(?<base>^.+)\.(?<extension>[^.]+?$)/
+  const match = s.match(pattern)
+  if (match && match.groups){
+    return {
+      fileName: match.groups.base,
+      fileExtension: match.groups.extension,
+    }
+  } else {
+    return {fileName: s}
+  }
+}
+
+const createFileNameDefaultOptions = {
+  meta_separator : "__",
+  category_prefix : "", 
+  tag_prefix: "<>", 
+  tag_separator: "",
+  lowerCase: true,
+  noSymbols: true,
+}
+
+export function createMetaFileName(originalFileName, meta={category:"", tags:[]}, options) {
+  const {
+    meta_separator,
+    category_prefix, 
+    tag_prefix,
+    tag_separator,
+    lowerCase,
+    noSymbols
+  } = {...createFileNameDefaultOptions,...options}
+
+  let {fileName, fileExtension} = parseFileName(originalFileName)
+
+  const category_string = `${category_prefix}${meta.category}`
+  const tag_string = `${meta.tags.map(tag=>tag_prefix+tag).join('')}`
+
+  fileName = `${fileName}${meta_separator}${category_string}${tag_separator}${tag_string}`
+
+  if (lowerCase) {
+    fileName = fileName.toLowerCase()
+  }
+
+  if (noSymbols) {
+    fileName = fileName.replace(/[^a-z0-9_-]/g,'-')
+  }
+
+  return `${fileName}.${fileExtension}`
+}