Configurable tips

[TehNut]

Each commit describes what it does, but as a tldr:

• Extract tips.txt to the config directory if it doesn't exist rather than reading from the jar.
• Read tips.txt from the config directory.
• Mark mod as properly clientside only, thus removing the need for proxies.
• Allow mods to send IMC messages to add new tips.

For more details, see the commit messages.

Brought up by a guy on Reddit