Console commands

[Liareth]

We need the following commands to be enterable in the console:

• load : loads the plugin.
• unload : if loaded, unloads the plugin.
• reload : unloads then loads the plugin

It would also be cool to have the ability to set config options from the console. Imagine ... :

• set NWNX_CHAT_LOG_LEVEL=7
• reload NWNX_Chat
  (now you have debug info, you debug on the fly to find an issue on a live server)
• unset NWNX_CHAT_LOG_LEVEL
• reload NWNX_Chat
  (back to normal)

Help should output info on these additional commands. It should be implemented through a service so other plugins can add their own custom commands.

• GetServices()->m_Commands->RegisterCommand(std::string command, std::function<bool(std::string)>) is an example API that could be used.

This is important for the profiler and could be very useful for many other plugins. I want people to be able to selectively load it during laggy times to get 30 seconds - 1 minute of important metrics then unload it again.

[mtijanic]

The RFE for console commands is done. The other things mentioned here are regarding plugin hotloading, which is a whole new issue - #637