Remove words such as fuck, crap, shit etc.
Remove other potentially offensive words from comments.
Tidy up other geopolicital terms in comments.

These was left over from the previous PRs.

Signed-off-by: Carlos Martín Nieto <carlos@cmartin.tk>

In libgit2: Move an enum out of an int bitfield in the HTTP transport.

In the parser: Use int bitfields and change some variable sizes to
better fit thir use. Variables that count the size of the data chunk
can only ever be as large as off_t. Warning 4127 can be ignored, as
nobody takes it seriously anyway.

From Emeric: change some variable declarations to keep MSVC happy.

Signed-off-by: Carlos Martín Nieto <carlos@cmartin.tk>

Bitfields suck. And if you make them with non-int types, they suck
in a non-standards compliant way. Like sucking sideways or something.

This commit removes all bitfields in the `http_parser` struct, and
replaces them with the minimal type needed to contain their values. Note
that the fields in the struct have been reordered so they can be packed
with 4-byte alignment.

This saves both memory on the parser (because non-int bitfields get expanded to
4byte in most compilers anyway) and time (because the fields are now
properly aligned and the compiler doesn't need to generate bit-level ops
to access them).