PluginInfoWrapper: Support new interface FredPluginFCPServer
- Deprecate code related to the old interface FredPluginFCP
PluginManager: Add function for getting FCP server plugins with the new interface FredPluginFCPServer
- Deprecates the old getFCPPlugin()
- Will be used by FCPPluginClient
- Throw instead of returning null since the case of not finding a requested plugin is not normal mode of operation and will not happen with high frequency.