Also fix a few issues in Electron code. This is not as polished yet, UI
from old mod support was reused for now and is likely broken. Mods can
be loaded, but there isn't much QoL around the support for now.
* Migrate Electron wrapper to ESM
Use ESM syntax for main process, move some fs usages to fs.promises,
switch to import.meta.url/import.meta.dirname to handle file paths;
clean up redundant code.
* Add TypeScript support to Electron wrapper
The support is very basic, tsc is used to transpile code. Build scripts
are modified to not copy any Electron code other than preload.cjs and
use an extremely cursed setup to call the TypeScript compiler.
* [TS] Rename platform/storage
* Rewrite Electron wrapper
MVP, missing some features from the old wrapper and most planned
features. Some of the functionality hasn't been verified.
