The exercise no longer needed any modifications to pass due to
advancements in Zig. This new exercise attempts to teach about
@compileError, @compileLog, and some comptime debugging. It tries to
help prepare users for the "super bonus challenge" in 075_quiz8.
The first exercise introduces the `packed` keyword as an alternative for
bitwise operations. Its main goals are establishing a solid understanding
of field order and conveying the fact that packed containers are basically
integers.
It introduces the concept of container layouts and briefly explains the
default `auto` layout before introducing the `packed` layout (but doesn't
touch `extern` at all).
The exercise also presents a real-world use case for packed containers,
namely LZ4 frame descriptors.
Furthermore it covers equality comparisons between packed containers.
The second exercise talks about switch statements with packed containers
and goes into some more detail on packed unions.
`test/tests.zig` fails after https://github.com/ziglang/zig/pull/25592 was
merged in. This just ensures that Io is passed, it might not be the
ideal solution.
`build.zig` was also failing due to new color parameter.
Currently users executing `zig build` to run the exercises,
may encounter compiler output that tells them to use
`-freference-trace=[num]` to see more of the hidden
reference traces, so we should pass this parameter to
the zigling exercise being compiled, so that the learner
can provide this parameter like they would normally, when
using `zig build` directly in normal Zig programs.
