Melda plugin cross platform portability

About cross platform compatibility for Melda plugins and others. Melda uses only on mac a “.bin” for the executables, since Renoise looks for executable name instead reading Info.plist contents, it will need a fix for platform transfer.

… I mean by adding the VST id in a new column in vst cache sqlite, but also keeping the old executable name mechanism for backwards compatibility. So if the plugin identifier is the executable name, and if it is the vst plugin identifier, open Info.plist and read actual executable file name from there.