ruby: explode ruby-core into subpkgs

ruby: explode ruby-core into subpkgs

ruby-core is problematic as it is too big.
It is impossible to fix pkgs dependencies as
ruby-core would generate multiple cycled dependencies
between packages.

Also, "core" in ruby context means "classes that does not need a 'require'".
This is not the case of ruby-core classes. They are, actually, a subset of
Ruby Standard Library.

In every detected case where a portion of ruby-core could be isolated and
save another pkgs from requiring all ruby-core where spin-off into a new
subset. Also, big portions of ruby-core, not require by current ruby-* pkgs
where spin-off in new pkgs. The remaining of ruby-core was put into a new ruby-misc.

ruby-stdlib was created as a meta package that requires all ruby packages that are
part of Ruby Standard Library. For a full Ruby Standard Library, just install
ruby-stdlib and its deps.

Created pkgs from ruby-stdlib:
- ruby-misc
- ruby-csv
- ruby-datetime
- ruby-dbm
- ruby-debuglib
- ruby-drb
- ruby-fiddle
- ruby-filelib
- ruby-logger
- ruby-math
- ruby-multithread
- ruby-mkmf
- ruby-net
- ruby-optparse
- ruby-patterns
- ruby-prettyprint
- ruby-pstore
- ruby-racc
- ruby-rbconfig
- ruby-rinda
- ruby-ripper
- ruby-sdbm
- ruby-shell
- ruby-socket
- ruby-uri

Some files from ruby-openssl where moved to new subpkgs (as ruby-net and ruby-drb).

All dependencies where redefined based on auxiliar script ruby_find_pkgsdeps

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>