also:
- removed `TOML_LARGE_FILES`
- removed unnecessary template machinery (esp. where ostreams were involved)
- made all overloaded operators 'hidden friends'
- documentation fixes
- version bump - this will form the foundation of v3
also:
- fixed config error in example `.vcxproj` files
- fixed spurious newline after JSON formatting a table
- fixed VS intellisense not detecting TOML_COMPILER_EXCEPTIONS correctly
- moved `parse_result` to a separate header
- made more internal macros require semicolons
- removed some old deprecations
- minor documentation fixes