dplug-build Windows Installer

[abaga129]

This adds support for the --installer flag in dplug-build on Windows.

Requirements

• Windows 10 SDK (must append path to signtool.exe to PATH variable)
• NSIS (must append path to makensis.exe to PATH variable)

Features

• works with all current plugin formats
• Ability for user to choose which "Components" to install
• Ability for user to set install directory for VST 32bit and VST 64bit
• Uses signtool from the Windows SDK to sign the resulting .exe
• custom header bmp image

plugin.json additions

The windows installer uses the following fields in plugin.json

windowsInstallerHeaderBmp - optional 150x57 bmp image to use in the header

keyFile-windows - Path to PFX keyfile. Duplicated from pace.json

keyPassword-windows - Password for PFX keyfile. Duplicated from pace.json

Looking forward to review!

[p0nce]

OK my review only contains the following:

• for LV2 bitness of dplug-build indeed says whether we can generate 32-bit LV2 or 64-bit LV2, however up to now I've considered that we just say we don't support 32-bit LV2. You can just assume a 64-bit dplug-build unless you are interested in Windows + 32-bit + LV2 format. So I'd say to not bother.

• I'm not sure the --installer will work if we build only & 64-bit VST, it will still propose both versions, but that's not bothering to me as that case will not happen for a long while.

So, I'm ready to merge without changes.

[abaga129]

I can work on those two cases and make a follow up PR. I think only supporting 64bit LV2 is a good idea. We could see if there is a way to gray out AAX and LV2 if the installer is being run on a 32bit machine. Then we can skip installing those formats