I initially tried to use the existing .clang-format file,
but it does not match the code style (at least with clang-format 11)
and the formatting is not consistent across files.
Therefore, I decided to rewrite the .clang-format with some personal
preferences.
Used command
find . -iname "*.hpp" -o -iname "*.cpp" | xargs clang-format -i -style=file
This modifies no logic, it simply adds the keyword `noexcept`
I believe this is 100% correct. It calls methods that are not
guaranteed to be `noexcept`, such as `operator[]` but have
no logically way of throwing.
Needed 1-2 cleanups by hand. 99% was automatic.
* The version that ships with ubuntu 14.04 seems to not work.
I had to build from scratch
* Use cmake to generate the build commands that clang-modernize wants
```sh
cmake -DCMAKE_EXPORT_COMPILE_COMMANDS:bool=true ../ChaiScript/
```
* Use the clang-modernize tool. Note that you have to be pretty explicit
about the include paths if you want it to also update your include
files
```sh
../llvm-build/bin/clang-modernize ../ChaiScript/src/*.cpp -for-compilers=gcc-4.8 -include /home/jason/ChaiScript/include,/hjason/ChaiScript/include/chaiscript,/home/jason/ChaiScript/include/chaiscript/dispatchkit,/home/jason/ChaiScript/include/chaiscript/language -p compile_commands.json
```
* In my case, it left some unused `typedef`s behind, which I cleaned up.
