Fix merge_patch shadow warning

Avoid shadowing a member of `this` by choosing the same name as
parameter (`-Wshadow`). Instead, make name of parameter more
expressive.

Fix EOL Whitespaces & CMake Spelling

Fix little leftover EOL whitespaces in `CMakeLists.txt` and
a spelling of CMake in README.md

Properly convert constants to CharType

Add macro to define enum/JSON mapping

Add BSON support

- added fuzz testers
- added some reference files
- made an exception text more clear

Merge branch 'feature/bson' of https://github.com/julian-becker/json into julian-becker-feature/bson

Allow to set error handler for decoding errors