Watch Application System in Haxe

wasp-os userland code, ported to Haxe and then modified to my taste.

This is hugely WIP material. See #20 for some screenshots.

What it currently does:

• Run on simulator or on a pinetime watch
• Display date / time / battery level
• Display notifications
• Count steps (logging still missing, see #13)
• Monitor heart rate (background monitoring still WIP, see #24)
• Wake on button, tap or double tap depending on settings (only button in night mode)

Available apps:

• Alarms
• Calculator
• Flashlight/Torch app
• Heart rate monitoring
• Night mode switcher
• Steps counter
• StopWatch
• Timer

Haxe changes

Needed Haxe changes to get a better output (which is needed for micropython):

• [x] Bytes literal
• [x] // operator
• [x] Array access without overhead
• [x] Do not generate __slots__ (until supported by micropython)
• [x] NativeArrayTools.nativeSort()
• [x] Add @micropython.native runtime metadata (undocumented @:python("micropython.native"))
• [-] Implement @:selfCall for python
• [-] Add support for positional arguments, sometimes mandatory with micropython
• [ ] Skip all the unneeded code when doing try / catch (e:SomeException)
• [ ] Skip generating empty classes/interfaces
• [ ] Avoid iterator mess more easily

See https://github.com/kLabz/haxe/tree/feature/micropython-utils or haxe submodule.