devel/matreskha: Upgrade version 0.6.0 => 0.7.0

Noticable improvements:

• Ada to Javascript translator and run-time library
• Servlet API support
• collation tailoring by CLDR collation data
• Enhanced XML SAX reader
• extended Universal_Character and Universal_String
• extended Universal_String_Vector and IRI
• Updated unicode to 7.0.0 and CLDR to 27.0.1
• Added uaflex - unicode aware flexible lex analyzer generator
• Streaming support: Ada <==> JSON