eval: implement -m option to preload modules

The -m option instructs the interpreter to automatically require the named
module and to register the module context as global variable.

The following two commands are equivalent, with the former one serving as
a shortcut for the latter:

    utpl -m fs -s '{{ fs.open("test.txt").read("all") }}'
    utpl -s '{% fs = require("fs"); print(fs.open("test.txt").read("all")) %}'

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

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