The clang-format configuration file format changed a lot in 10 years,
with more nuance than booleans.

This change tries to update the style, kept close to LLVM style,
with 4 spaces indent.

[ Line length ]

The number of columns is pushed from 80 to 100, to be coherent with black style
for Python language. Black has a soft wrapping notion to avoid to cut lines near

80. As this is not possible with clang-format as far as I know, 100 will do.

[ exceptions4c ]

Our try/catch construction is a C macro. Define the language as C++ is a trick
to let clang-format consider try and catch as language flow control tokens.

[ Don't try to pack arguments a smart way ]

The strategy to align arguments is more conservative, to avoid diff noise:

• every argument can be kept in 100 columns -> keep as one line
• any longer expression -> one per line

This remove the BinPack previous system.

Ref T620

Reference:

• https://clang.llvm.org/docs/ClangFormatStyleOptions.html
• https://clang-format-configurator.site/
• https://github.com/Wirena/clang-format-configurator-v2