[kilo][linenoise] Update to newer window size ioctl

Change-Id: I6b1b08a7e140926c92ee10ae00b5ed628613769c

[zx] Magenta -> Zircon

The Great Renaming is here!

Change-Id: I3229bdeb2a3d0e40fb4db6fec8ca7d971fbffb94

[mxio] Remove most uses of mxio_wait_fd

The two remaining callers can actually have a finite timeout.

Change-Id: I48c4af3604c46af4cb614e36777603c55b46d65e

[kilo] Use ioctl wrappers

Change-Id: I2d3e339bc06a8d7b250341046ffc36c48946c4d2

[magenta] migrate from libddk to magenta/device headers

Change-Id: I91a8df001043635fa595d6fed1a6d6f092fc6b3e

[magenta][ddk] normalize ioctl defines

- ioctls are now unique
- ioctls now encode a kind, family, and number
- ioctls that return a handle are of IOCTL_KIND_GET_HANDLE
- remoteio plumbing updated to reflect this
- drivers and ioctl users updated

Change-Id: Ic202cec6336a4915b09e3cbfff5dc6389f397288

[build] define __Fuchsia__ in userspace, not __MAGENTA__

This aligns the Magenta userspace build with the Fuchsia userspace
build, as far as how userspace source can identify the platform its
building for.

Change-Id: Iea807884204197ab058a2e24440574196d516a2c

[kilo] temporary hack to make save work

This can go away once we have truncate() or rename() wired up, and
is flagged with an UNSAFE_SAVES ifdef as a reminder.

Change-Id: I11d14a6db90fbd3f2665f31d38a7853a83207629

[kilo] treat newline as enter

Fixes an issue where hitting enter on Magenta inserts a 0x0A into
the text instead of creating a new line.

Change-Id: Iec13a137ee8f24a4ae19ca5f91ad47c57adadf91

[uapp][kilo] build Kilo editor for Magenta

It runs on the gfxconsole but is not entirely usable yet.
It's exposing some vt100 emulation and fileio bugs.

Change-Id: I4bd4ad32269bfe03b93aadc567700574cdc1649c

[uapp][kilo] initial import of Kilo editor from github

https://github.com/antirez/kilo
62b099af00b542bdb08471058d527af258a349cf

Change-Id: I6e2f9077d475a5a9408df7f44a984f68478a7354