Convert campaigns.conf and tutorials.conf to Lua

[bunnybot]

data/campaigns/campaigns.conf and data/campaigns/tutorials.conf are the only read-only conf files left, and we should convert them to Lua files and load them as LuaTable. This will make them easier to edit and maintain.

They are used in ui_fsmenu/campaign_select.cc and logic/campaign_visibility.cc.

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Imported from Launchpad using lp2gh.

• date created: 2016-10-19T05:45:22Z
• owner: gunchleoc
• the launchpad url was https://bugs.launchpad.net/bugs/1634750