community/duktape: take over maintainership

emailed the previous maintainer and received permission to take over this aport

also improve:

  - move the library to -libs

  - don't build duplicate (due to debug symbols being
    stripped) libduktaped that differs only in soname

  - instead, build libduktape with -g and split -dbg subpackage

  - build CLI interpreter with linenoise support

  - install MIT license into -doc