Add new port devel/simple_components

Submitted via IRC by Rod Kay (charlie5 on Freenode #ada)

This is a library created by Dmitry Kazakov out of necessity, which was
released under the GMGPL and provides Ada implementations of:

• smart pointers - B-trees
• directed graphs - stacks
• sets - tables
• maps - string editing
• unbounded arrays - expression analyzers
• lock-free data structures
• synchronization primitives (events, race condition free pulse events, arrays of events, reentrant mutexes, deadlock-free arrays of mutexes)
• pseudo-random non-repeating numbers
• symmetric encoding and decoding
• IEEE 754 representations support
• multiple connections server/client designing tools.

Tables management and strings editing are described in separate documents;
see Tables and Strings edit. The library is kept conform to the Ada 95,
Ada 2005, Ada 2012 language standards.