dplug-build improvements

[p0nce]

• Mac: Codesigning should be --deep => actually no, it's deprecated
• Mac: package build should use xcrun
• Mac: code signing should use xcrun
• Mac: notarization upload should support --keychain-profile <profile> instead of --team-id %s --apple-id %s --password %s => new key in plugin.json to do that: "keychainProfile-osx"
• Mac: try with hardened runtime --options=runtime: worth it? Doesn't seem strictly needed, but Surge and Audio Damage do this nowadays. => added, seems to work and pass notarization
• Windows: should display where the installer is, and size of installer

[p0nce]

Done