New build system, ready for review, QA, and merge

[zootella]

Ready for review

[zootella]

= still there, - removed, + added
npm weekly downloads
looking at package.json and package-lock.json, versions in
tortuga, main branch, and this new vegan branch

                                     tortuga  main  vegan
= S electron                   253k        7     2      2
- S electron-squirrel-startup    5k        -     1      -
+ S electron-updater            42k        4     -      4
= D electron-builder            96k       22    20     20
- D electron-installer-dmg       5k        -     2      -
- D electron-installer-windows  <1k        -     1      -
- D electron-osx-sign           77k        -     0      -
- D electron-packager           40k        -    13      -
- D electron-winstaller          9k        -     2      -
+ D electron-notarize           42k        0     0      0

Notes at this step:

• Removing and adding all those modules, happy to say it still builds and runs
• Glad to have removed low-use modules, like electron-installer-windows and electron-winstaller
• Tortuga is using npm's latest and greatest, with electron 7 and electron-builder 22. Adding electron-builder to the file manager results in version 20 coming in--there must be something old in there that isn't compatible with 22.

My hope is that Tortuga's building and updating will work great with either set of versions. If it doesn't, then I'll either have to (1) update file manager, or (2) test Tortuga with file manager's old module versions. Updating the file manager would be great, and is something we need to do later, but right now just getting notarization and updates working again is the smaller scope.