NintendoSDK: Update nn::os::Tick to struct

[MonsterDruide1]

Required after merging open-ead/nnheaders#48

---

This change is 

[MonsterDruide1]

Build checks obviously fail, because sead and nnheaders need to be updated at the same time. I manually checked that SMO compiles and this introduces no mismatches, no idea about BotW though.

[leoetlino]

Reviewed 5 of 5 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @MonsterDruide1)

---

include/time/seadTickSpan.h line 18 at r1 (raw file):

    s64 toS64() const { return mSpan; }
    u64 toTicks() const { return mSpan; }

hmm, why did we have both toS64 and toTicks in the first place...? maybe we should just remove toTicks

[MonsterDruide1]

I removed it in another commit - it requires two explicit casts, what do you think about it?

[leoetlino]

idea: can we add a constructor to nn::os::Tick that takes a s64 (or u64, but I think s64 is more likely since we know that sead::TickSpan uses s64 all over the place)?

[MonsterDruide1]

nn::os::Tick uses u64 internally. It makes sense that TickSpan is using s64, as it is the result of two Ticks being subtracted (=> can be positive or negative), but constructing a Tick from negative numbers does not make sense, so I think s64 is just wrong here.

Adding a nn::os::Tick::Tick(u64) allows the following replacement:
nn::os::ConvertToTimeSpan({static_cast<u64>(duration.toS64())})
=>
nn::os::ConvertToTimeSpan(duration.toS64())

[leoetlino]

makes sense - u64 sounds like the better idea to me then

[MonsterDruide1]

Updated accordingly.