v1.2.3

Fixes:

• fixed printing of inf and nan
• fixed parser not handling floats with leading '.' characters
• fixed pedantic vtable warnings on clang with -Weverything
• fixed a number of documentation bugs
• fixed TOML_UNRELEASED_FEATURES default being 1 (it should have been 0)

Additions:

• added TOML_PARSER configuration option
• added TOML_LIB_SINGLE_HEADER indicator
• added doxygen page for the configuration options
• added SPDX-License-Identifiers around the place

Changes:

• split some header files up to make future maintenance easier
• refactored and greatly simplified parser