ucommon: updated to 7.0.0

Changes from 6.6.0 to 7.0.0
- clean new library abi 8.0
- atomic typeref system completed, matches tychomt spec
- c++11 support completed
- deprecated functions and templates removed
- deprecated modules (xml, persist) moved to commoncpp

Changes from 6.5.7 to 6.6.0
- introduced rsa key support
- expanded hmac support
- expanded digests for sha256 and 384
- reword of common digest code
- improved nullptr clang support
- remove clang forced c++11 from build
- check for openssl rsa support
- port types for 7.0 migration
- socket addresses for typeref
- further c++11 header fixes
- removed old ssl demo app

Changes from 6.5.6 to 6.5.7
- improved c++11 support
- mapped pointer introduced
- fixed is usage
- improved mapref remove

Changes from 6.5.5 to 6.5.6
- simplified arrayref
- added listref
- map iterators thru locked instances
- type standardization
- socket address type

Changes from 6.5.4 to 6.5.5
- more portable nullptr support
- thread-safe mapref class
- some typeref convenience types
- bit operations on byterefs

Changes from 6.5.3 to 6.5.4
- secure string and key management types
- better cleanup of secure objects
- file i/o for heap temporary

Changes from 6.5.2 to 6.5.3
- arrayref now uses ConditionalAccess, fix for Conditional

Changes from 6.5.1 to 6.5.2
- memory management cleanup and mingw32 support for native conditionals
- new methodology of having getaddrinfo allocate memory
- introduction of queueref and stackref; arrayref becomes useful
- typeref concatenation operators

Changes from 6.5.0 to 6.5.1
- thread shared references added

Changes from 6.4.4 to 6.5.0
- typeref expanded
- arrayref introduced
- nullptr and other c++ modernizations
- clang now defaulted to c++11
- minimum native windows now requires conditionals
- mingw has to use win32 pthread support
- somewhat more usable heap temporary templates

Changes from 6.4.3 to 6.4.4
- additional typeref operators

Changes from 6.4.2 to 6.4.3
- fix for broken windows setuid macro

Changes from 6.4.1 to 6.4.2
- solaris related cmake fixes
- cleanup of test build and osx fixes

Changes from 6.4.0 to 6.4.1
- keyfile fixed constructor issue

Changes from 6.3.6 to 6.4.0
- new typeref system for immutable atomic reference counted objects
- heap management objects support moving heap through assignment
- extended unit tests for typeref system
- improved openbsd support
- atomics enabled by default

Changes from 6.3.5 to 6.3.6
- code cleanup
- simulate option for scrub
- set newline style for cmake genorated files

Changes from 6.3.4 to 6.3.5
- general code cleanup
- some build fixes

Changes from 6.3.3 to 6.3.4
- improved atomics support
- configure atomics default matches cmake default
- general code cleanup
- more casting operations and cast fixups
- polymorphic casting support & rtti detection
- enclose random value templates in Random
- improved rng support

Changes from 6.3.2 to 6.3.3
- improved cipher key management
- b64 support improved and string hex conversions
- simplified digest functions
- some solaris fixes

Changes from 6.3.1 to 6.3.2
- fixed a broken streambuf for commoncpp
- deref cast function added
- fixed missing pkg-config

(adam)