fix: add compound statement to call expression

* feat: allow identifiers in string concatenations

Resolves errors in strings of the form:

   ("failed in line %" PRIdLINENR)

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Co-authored-by: Lewis Russell <lewis6991@gmail.com>

fix: allow preproc define without value to preceed a line with whitespace

add multi-bitfield structs and enums with underlying types

Adding support for offsetof

Fix AppVeyor CI builds

Update used Windows image and NodeJS version to the latest LTS

Add _Noreturn, __restrict__, and _Generic

_Generic is a C11 feature, __restrict__ and _Noreturn were added to type_qualifiers

Add CI & Lint actions

fix: comments can have multiple delimiting backslashes

Support optional consequences

It's allowed in gcc and clang

fix: implement Unicode identifiers

According to cppreference, identifiers are `(XID_Start | '_')
XID_Continue*`, which is the case as of C++23 and C2x. I have confirmed
this myself with the drafts of C++23 and C2x.

https://en.cppreference.com/w/cpp/language/identifiers

Clang indeed implements identifiers as `(XID_Start | '_') XID_Continue*`
in C++ mode and C2x mode, with a slight extension to the character set
to include some extra math characters:
231992d9b8/clang/lib/Lex/Lexer.cpp (L1517-L1530)

Add an action to publish the grammar automatically

This also lets it bind to _any_ statement, which is necessary for some
c++ attributes that can attach to the statement in if, while, and
do/while statements.

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