Namespace and organize lcf headers

[fmatthew5876]

We need to reorganize the code before we can declare the liblcf API stable.

• Make all users #include <liblcf/foo.H> to avoid header conflicts.
• Put all liblcf code in an lcf:: namespace.

[Ghabry]

• Get rid of everything in "Data::", global variables are ugly

[fmatthew5876]

As a first step, we could move Data:: to player and get it out of liblcf.

There are some parts of the liblcf parser that depends on grabbing stuff from Data::. That has to be refactored.

[fmatthew5876]

I'd like to propose we do this header file and namespace change sometime when we cut 6.2 release.

The main thing blocking me from doing it now is rebase hell. I wouldn't want to make a namespace PR here and in Player and have it stay for a long time and cause lots of rebase conflicts with other PRs.

Seems like right before a release when we have a rush to get everything in would be a good time to cut over.

[Ghabry]

moving this to 0.7.0 for now

[carstene1ns]

Seems like right before a release when we have a rush to get everything in would be a good time to cut over.

Yeah, because nobody makes mistakes when in a rush. 🙄 This is to be done right after a release, not before.

[fmatthew5876]

Ok sure, but maybe we could try to coordinate it, like right after the 6.2 release so it doesn't stay pending too long? This one is a rebase nightmare.