Update Asset directory functionality to recursively search the directory and call apk.addFileInput for each file

[Blayung]

Update Asset directory functionality to recursively search the directory and call apk.addFileInput for each file

Fixes #62

[silbinarywolf]

Test your changes before raising a PR please. This code is failing tests at compile-time

[Blayung]

Sorry, I forgot to try to compile an example. It should work now but the github CI was cancelled for some reason.

[silbinarywolf]

Sorry, I forgot how to properly test a library. It should work now but the github CI was cancelled for some reason.

Its failing on Zig 0.16.X (current master), as per the Mac CI build info. (If one platform fails, it cancels the other builds)

To be cross-compatible need changes like this:

const cwd = if (builtin.zig_version.major == 0 and builtin.zig_version.minor <= 15)
    try std.fs.cwd()
else
    try std.Io.Dir.cwd()

From Zig 0.16.X onwards too, most the function calls require an Io interface, which can be obtained from std.Build via g.b.graph.io

[silbinarywolf]

awesome, thank you!