AK: Borrow exact format syntax form std::format.

Instead of just implementing format specifiers ad-hog this commit
implements the exact syntax std::format uses.

There are still a ton of features that are not supported by this
implementation, however, the format specifiers should be parsed
correctly.

In some cases however, the format specifiers aren't quite parsed
correctly, for example:

    String::formatted("{:{}}", 42, 4)

should produce the string "  42" however an (unrelated) assertion fails.
This is because vformat doesn't consider nested parentheses. I have to
spend some time coming up with a simple way of doing this, I don't feel
like doing that right now.

The fundamental code for this already exists, by limiting the number of
format arguments (arbitrarily) to 256 large widths are used to encode
that these should be taken from other format parameters.

0 files changed, 0 insertions, 0 deletions