0.7.0

• (!) refactor: ScalableNumber renamed to Representation
• (!) refactor: output stream operators moved to the units/quantity_io.h header file
• (!) refactor: Refactored the library file tree
• (!) refactor: quantity::count() renamed to quantity::number()
• (!) refactor: data system renamed to isq::iec80000 (quantity names renamed too)
• (!) refactor: *deduced_unit renamed to *derived_unit
• (!) refactor: got rid of a noble_derived_unit
• refactor: quantity (kind) point updated to reflect latest changes to quantity
• refactor: basic concepts, quantity and quantity_cast refactored
• refactor: abs() definition refactored to be more explicit about the return type
• feat: quantity (point) kind support added (thanks @johelegp)
• feat: quantity references support added (thanks @johelegp)
• feat: quantity aliases support addded
• feat: interoperability with std::chrono::duration and other units libraries
• feat: CTAD for dimensionless quantity added
• feat: modulation_rate support added (thanks @go2sh)
• feat: SI prefixes for isq::iec80000 support added (thanks @go2sh)
• feat: a possibility to disable quantity UDLs support with UNITS_NO_LITERALS preprocessor define
• feat: a support to define ISQ derived dimensions in terms of different number or order of components
• perf: preconditions check do not influence the runtime performance of a Release build
• perf: quantity_cast() generates less assembly instructions
• perf: temporary string creation removed from quantity::op<<()
• perf: value initialization for quantity value removed (left with a default initialization)
• perf: limited the equivalent trait usage
• perf: limited the C++ Standard Library headers usage
• perf: rvalue references support added for constructors and getters
• (!) fix: exp() has sense only for dimensionless quantities
• (!) fix: dim_torque now properly divides by an angle (instead of multiply) + default unit name change
• fix: quantity's operators fixed to behave like the underlying types do
• fix: quantity_cast() fixed to work correctly with representation types not convertible from std::intmax_t
• fix: ambiguous case for empty type list resolved
• fix: downcasting facility for non-default-constructible types
• fix: restore user-warnings within the library implementation
• fix: the text symbol of foot_pound_force and foot_pound_force_per_second
• fix: quantity modulo arithmetics fixed
• (!) build: Conan testing version is now hosted on Artifactory
• (!) build: Linear Algebra is now hosted on its Artifactory
• (!) build: BUILD_DOCS CMake option renamed to UNITS_BUILD_DOCS
• build: doxygen updated to 1.8.20
• build: catch2 updated to 2.13.4
• build: fmt updated to 7.1.3
• build: ms-gsl replaced with gsl-lite/0.38.0
• build: Conan generator switched to cmake_find_package_multi
• build: Conan CMakeToolchain support added
• build: CMake scripts cleanup
• build: ccache support added
• ci: CI switched from Travis CI to GitHub Actions