Adds a check to the Windows nsis installer and uninstaller
that will show an error popup if Electrum is still running to prevent
a broken installation that happen if the installer only partly
overwrites the existing installation (see #6748).
This works by trying to open the .exe files in the Electrum installation
directory in append mode, if Electrum is still running the installer
will not be able to open the .exe and the check fails.
Based on https://github.com/Electron-Cash/Electron-Cash/pull/2185
setup exe used to install Electrum to `C:\Program Files (x86)\Electrum`,
but now as the binaries are amd64, we should install to `C:\Program Files\Electrum`.
With this change, based on my experiments, looks like if there is an existing install,
nsis will keep using that path, but if it's a fresh install, it will now use the 64-bit path.
follow-up fcc4e1d387
Before, it was only possible to test commits that are
on Github (pull request or merged). Now, changes can be
tested locally too.
This introduces the risk that a release could be built
containing uncommitted changes which by definition breaks
deterministic builds. Fortunately, this will always be
detected because the version string is created using
`git describe --tags --dirty`.
Also, retire $TARGET variable because it decouples the
build scripts from the commit revision to be built. This
is a problem for deterministic builds.
