Without this timeout the peak volume update, which was received last,
would be used permanently until the next update arrives.
This might only take place when the source produces audio output again.
OBS might very rarely not update _peak quickly enough when very low
intervals are configured on the General tab.
In that case _peak might be set to negative infinity still, which will
result in unexpected behavior, so we use the previously valid peak value
instead.
The "core" macro conditions and actions have been extracted out to the
"base" plugin.
The library now mostly contains functionality which is required across
all plugins and (e.g. definitions for macro segments).
The goal is to reduce the complexity and cross-dependencies and group
the source files in a better way.
This should relsove the "library limit of 65535 objects exceeded" build
issue occuring in some Windows build environments.
