v0.6.0

NOTICE: License changed from MIT to APACHE 2.0

Added Features

• Added estd::variant
• Added estd::variadic namespace
  • variadic::types for compile-time management of class ...Types
  • variadic::values for compile-time management of T ...Values (overlaps with estd::index_sequence)
  • variadic::selector for compile-time evaluation of class ...Types
  • variadic::visitor for runtime visitor pattern applied to class ...Types
• Added ESTD_VERSION macro for compile-time version query

Quality Updates & Bug Fixes

• is_base_of no longer caught up on access modifierrs
• General Arduino, AVR, c++03 compatibility
• estd::optional and estd::expected much more robust
  • shares code base with estd::variant
  • when available, exceptions are now supported
• estd::num_get and by extension istream integer parsing now returns min/max value on overflow
• estd::priority_queue works on more targets

Known Issues & Limitations

• estd::variant not functional on AVR, probably bugs in #7