Fix electron app (#1003)

Updates to the latest version of electron and moves the backend-frontend
communication from node-ipc to websockets. This resolves the previous
roadblock regarding `nodeIntegration` .

Done

- Remove node-ipc in favour of websockets. 
- Move file copying out of `preload.js` to avoid importing module `fs`
there
- Bump all electron pacakge versions to the latest
- Added new package for finding open ports as node-ipc is gone
- Tweaked webpack config for above changes


Partially fixes #468

Questions/ Pending:
- Literally every single test fails for me, presumably some issue with
my setup/environment.
- The websocket communication is not using TLS. I'm not sure how to
enable this, or if we even need to as its all local.
- Still need to create the CI for building/deploying but I'm not sure
where start in this regard as i have no exp with it. Presumably we will
need to point the electron auto-updater to the github releases url's. If
people are happy with this PR I will look at adding the CI before its
merged.
- In dev mode only, I have disabled TLS security becuase my docker
container's cert is not signed. I _assume_ this will be true for other
people who spin up the server on thier own hardware. Perhaps I just need
to change my cert to one from letsencrypt or something...

Notes.
I have not touched javascript in eons so my apologies if the commit
trail is a bit fragmented. I tried to keep them fairly contained and
then there is a slightly gnarly final commit fixing all the linter
issues... Please let me know if you want me to squash some commits etc.

I initially tried to move this to web workers the same way the web app
does it but this was unsuccessful. I have found no way to spin up a
worker in one place (frontend/backend) and then pass this worker to the
other. The electron ipc channels don't allow you to directly pass
objects such as workers, everything is cloned/serialised. Passing a port
number so the other end can spin up its own socket works fine.

---------

Co-authored-by: Shazib Hussain <contact@shazib.com>
Co-authored-by: Jed Fox <git@jedfox.com>

bin/make-release

@@ -42,7 +42,7 @@ git tag -a "$VERSION" -m "$NOTES"
 git push origin "$VERSION"
 
 # Make a macOS version
-./bin/package --release --version "$VERSION"
+./bin/package-electron --release --version "$VERSION"
 
 # TODO: browser version
 

bin/package-electron

@@ -74,19 +74,15 @@ if [ "$OSTYPE" == "msys" ]; then
     fi
 fi
 
-# We only need to run linting once (and this doesn't seem to work on
-# Windows for some reason)
-if [[ $CI != true && "$OSTYPE" == "darwin"* ]]; then
-    yarn lint
-fi
-
 yarn patch-package
 
+yarn rebuild-electron
+
 yarn workspace loot-core build:node
 
 yarn workspace @actual-app/web build
 
-yarn workspace Actual update-client
+yarn workspace desktop-electron update-client
 
 (
     cd packages/desktop-electron;
@@ -103,7 +99,7 @@ yarn workspace Actual update-client
         echo "\nCreated release $VERSION with release notes \"$RELEASE_NOTES\""
     elif [ "$RELEASE" == "beta" ]; then
         yarn build --publish never --arm64 --x64
-        
+
         echo "\nCreated beta release $VERSION"
     else
         SKIP_NOTARIZATION=true yarn build --publish never --x64