Cf. !4

Applied clang-tidy modernize-use-override globally in order to achieve compliance in current code base.
Added warning `suggest-override` for CMake target `framaCIRGen` in order to detect future breaches.

Cf MR !3

Paragraph 4.1 (framaCIRGen specific options) of the frama-clang documentation states that the parameters `--info`, `--warn` and `--debug` might be used to enable extra messages at runtime. They don't appear to be implemented right now. Instead, execution gets stuck in an infinite loop.

merges !2 and fixes frama-c#2564

Partial revert of d2210718: the fix introduced in this commit
basically let template instances occur before the definition of the
actual parameter. With AST reordering in ir2clang, this should be less
of an issue as it once was, but for the time being I prefer to rely on
having some reordering also on the clang2ir side. As matter of fact, the
original issue was that we fail to set the name of [copyFunc] to a
fully qualified version, so that it didn't define the correct symbol:
we had two completely separate functions (i.e. test::func and ::func
in issue2564.cpp), one being actually unused.

This allow analysis for a widely used C++ construct. Please find more details in the bugtracker:
frama-c#2564

merge !1

The explicit cast is necessary even though the value for `t` is passed in as an r-value, because it becomes an l-value as soon as it is assigned to the variable.

Fix translation of negative integer litterals

See merge request frama-c/frama-clang!169

and remove useless declaration

Support for editing the translated C file and keeping demangling options afterwards

See merge request frama-c/frama-clang!166

[machdep] add support in Frama-Clang for x86_64_msvc machdep of Frama-C

See merge request frama-c/frama-clang!165

hide -kernel-msg-key behind a proper FCLang option