v2.2.0

Fixes:

• fixed some issues building with VS2017 (#55) (@sobczyk)
• fixed _Float16 erroneously detected as supported on g++ (#57) (@sobczyk)
• fixed <Windows.h> causing compilation failure on mingw (#63) (@rezahousseini)
• fixed CMake and pkg-config files not being installed into architecture-agnostic directories (#59) (@tambry)
• fixed memory leak during parsing (#64) (@sneves)
• fixed ambiguous operator== error on MSVC (#56) (@HellsingDarge)

Additions:

• added additional node_view constructors
• added ability to specify serialization format of integer values
• added integer value serialization format round trip (e.g. hex in, hex out)

Changes:

• updated conformance tests
• TOML version bump to v1.0.0-rc.3
• refactors and cleanups based on feedback given here

Build system:

• renamed build options to snake_case
• tests, examples and cmake config now explicitly disabled when used as a subproject
• removed small_binaries (it's now implicit when building as release)
• bumped minimum meson version to 0.53