[syscalls] Change vmar_... calls

- Create zx_vm_option_t type
- Change ZX_VM_FLAG_... to ZX_VM_... and make them new type.
- Change int32_t flags parameters to zx_vm_option_t options
- Make the options parameter be second.

- Modify vmar_..._old functions to keep other repos working.
Once they've all been updated these functions will go away.

ZX-2264
Test:CQ

Change-Id: I1faf4cc4e1e4dabf3d8ef680e398d83a545b0f09

[zx] Magenta -> Zircon

The Great Renaming is here!

Change-Id: I3229bdeb2a3d0e40fb4db6fec8ca7d971fbffb94

[magenta][status] Get all the MX_OK and MX_ERR_* stragglers

Change-Id: Iab1fb48e513cb5edd691a7382e0a6599180a2f6c

[ulib][task-utils] Add get_task_by_koid()

Change-Id: I32866eb376539d2f58912d271966c91bcd28f1b0

[uapp] Make vmaps print the mapped VMO's koid.

Change-Id: Ifbd682ebbb95fa1c27b4a9d6a4198387cf848166

[psutils][task-utils] Add --json flag to ps

The --json flag instructs ps to produce output in JSON for easier
tooling.

Change-Id: I1f3881899d79f1ea0992f0cd53882c33230df067

[vm] Remove name from VmMapping

Use the mapped VMO name instead when describing a VmMapping.

Also, stop referring to MX_MAX_NAME_LEN inside VmObject, which was a
layering violation.

For MG-689: "Useful names for VMARs/VMOs"

Change-Id: I2ded3e0422446ecf6484e60658da170adcc0f805

[ulib] Move psutils's size-formatter into ulib/pretty

Also make format_size() return its string arg to make
printf-chaining easier.

Change-Id: Ie330df9e3b30ea082b759084186c66629df90cf6

[ulib] Move psutil's processes.c into ulib/task-utils

- Clean up the API a little
- Call the callback on the root job, and find its koid
- Don't walk processes/threads if no callback is provided

Change-Id: Ia77cc84b5aee4ef331ec28054d36ae0aad67e5a0

[uapp][psutils] add thread callback

nothing done with it yet

Change-Id: I098824659321834c765e0c14ed9b312b4662997a

[uapp] New vmaps tool to dump process memory maps

Change-Id: I1cd552aa4c598029949b568f03c0f3f885508fe2