krita: create wrapper

You can tell Krita to look for plugins at an alternative
directory using KRITA_PLUGIN_PATH env variable.

Unfortunately you can only specify a single path at a time.
Some plugins necessary for krita to funciton are built
in the same derivation, this necessitates the use of `symlinkJoin`.

This patch adds a wrapper around krita that allows yout to add
more plugins than those provided by default.

Example structure of a plugin:

/nix/store/00000000000000000000000000000000-krita-plugin-example-1.2.3
└── lib
   └── kritaplugins
      └── krita_example.so

Once you have a plugin, you can add it to krita:

```nix
pkgs.krita.override {
    plugins = pkgs.krita.plugins ++ [
        your-plugin
    ];
}
```

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