Add support for mapping LibLog messages to Cake in the addin

[Spiralis]

• Existing LogProviders: https://github.com/damianh/LibLog/tree/master/src/LibLog/LogProviders
• Sample: https://gist.github.com/damianh/fa529b8346a83f7f49a9#file-liblogmsowinlogging-cs-L23-L72
• Sample: https://github.com/damianh/LibLog/blob/master/src/LibLog.Example.ColoredConsoleLogProvider/ColoredConsoleLogProvider.cs
• LibLog gitter: August 21, 2018 11:30 AM