updated build script for vanilla js projects

Updated the build script to check if the `import` line for a file is
referencing the editor scripts base package, and when there is a match
the `import` statement will be changed from:

```js
from "@phaserjs/editor-scripts-base.js";
```

to

```js
from "../../phaserjs_editor_scripts_base/index.js";
```

This fix has a few limitations:

* if any other npm packages are added to this library, this change will
not fix those
* the generated `phaserjs_editor_scripts_quick` needs to be placed
at the root of the phaser editor project, next to the original location
of the `phaserjs_editor_scripts_base` folder.

Signed-off-by: Scott Westover <[email protected]>

build-browser.js

@@ -56,6 +56,9 @@ function processJSFiles(fromFolder, toFolder) {
 			const importRegex = /from "([^"]+)"/g;
 
 			content = content.replace(importRegex, (match, p1) => {
+				if (p1 === '@phaserjs/editor-scripts-base') {
+					return `from "../../phaserjs_editor_scripts_base/index.js"`;
+				}
 				return `from "${p1}.js"`;
 			});
 
@@ -78,4 +81,4 @@ fs.mkdirSync(`browser/${name}`, { recursive: true });
 
 fs.writeFileSync(`browser/${name}/library.txt`, version);
 copyFiles("src", `browser/${name}/`, ".scene", ".components");
-processJSFiles("out", `browser/${name}/`);
+processJSFiles("out", `browser/${name}/`);