Cleaner RTP sync, Fennel update (bug fixes!) and assorted bug fixes

[Olical]

Hello Fennel hackers! I hope the sky is as blue where you are as it is outside my window 🌞

• Fixed a duplicate synchronisation step between your Neovim runtimepath and the Lua package path. This actually means we benefit from all the lazy loading of the Fennel compiler I did in the last update. This last little thing hanging on caused most of my load time optimisation work to not fully kick in.
• Updated Fennel to 0.9.2 then a few commits beyond that to include a fix for escaping characters. You may have noticed weird errors if you were tying to map something to \\ etc, that should be okay now!
• Only loading the autoload tooling when it's actually used now, so autoload is autoloaded. Such meta, very wow.
• You can now autoload modules that export a function instead of a table! Magic!
• Added a string.gsub to correct rare backslash paths to forward slash delimited on Windows. One Neovim function was returning backslashes on Windows which caused mixed separator paths on Windows and broke aniseed.env for those users. Thanks @Kethku!

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