Allow setting a custom app ID/bundle ID

[npckc]

Hello,

All apps built with twine-app-builder seem to have the same app ID, which results in one app writing over the other when another is installed. On Windows, they are all installed in the same directory (%AppData%\Local\test_electron_forge), so for example, if you have installed app A, and then install app B, app B overwrites app A in the test_electron_forge folder.

I think this could be fixed by adding appId to package.json in github.com/lazerwalker/electron-wrapper-template, and allowing users to set the appId individually so that created apps have different IDs, but I am not too familiar with Electron so I might be wrong on this point.

[lazerwalker]

Argh, good catch! That fix sounds exactly right.

Thanks!