main: allow prefixing -e and -E options

By specifying a name, followed by an equal sign before the actual option
value, the corresponding JSON data is stored as global variable with the
given name, instead of turning each object key into a variable itself.

For example while `utpl -e '{ "foo": true, "bar": false }' ...` will set
two variables `foo` and `bar`, the alternative syntax
`utpl -e 'baz={ "foo": true, "bar": false }' ...` will declare a single
variable `baz` holding the object `{ "foo": true, "bar": false }`.

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

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