Upgrade to Electron 13. Remove electron-webpack dependency.

[szTheory]

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[szTheory]

Currently blocked by lack of ES module support in Electron 13, even it is based on Node 14 which is supposed to support ES modules. Gives this error:

App threw an error during load
Error [ERR_REQUIRE_ESM]: Must use import to load ES Module: /projects/exifcleaner/dist/src/main/index.js
require() of ES modules is not supported.
require() of /projects/exifcleaner/dist/src/main/index.js from projects/exifcleaner/node_modules/electron/dist/Electron.app/Contents/Resources/default_app.asar/main.js is an ES module file as it is a .js file whose nearest parent package.json contains "type": "module" which defines all .js files in that package scope as ES modules.
Instead rename index.js to end in .cjs, change the requiring code to use import(), or remove "type": "module" from /projects/exifcleaner/dist/package.json.

See this issue on the Electron issue tracker: electron/electron#21457