Change macros to numeric_limits

Do proper endian conversions

CMake: Optional Install if Embedded

Add operator/= and operator/ to construct a JSON pointer by appending two JSON pointers

Fix gcc9 build error test/src/unit-allocator.cpp (Issue #1472)

Use C++11 features supported by CMake 3.1.

Update Buckaroo instructions in README.md

fix GCC 7.1.1 - 7.2.1 on CentOS

closes https://github.com/nlohmann/json/issues/670

This fixes all testsuite failures on big endian hosts.

 * Updates Buckaroo instructions to v2

Rename private json_pointer::is_root as public json_pointer::empty for consistency with std::filesystem::path

Fix typo in README.md

Fixes https://github.com/nlohmann/json/issues/1486.

Implement contains() member function

Fix documentation