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kotlinlang

Hi, using Kotlin on Android since last October, I've been developing apps interacting through Bluetooth and Bluetooth Low Energy. That's where you deal a lot with bytes, and hardcoding bytearrays has been really painful.
You need to add `0x` prefix to each hex byte, and when it reaches values that are equivalent negative 8 bit integers, you need to add `.toByte()`, plus the comma and space between each byte.
This is extremely verbose, and I had to use hex string to byte array conversion instead to make my code readable.
Could Kotlin 1.2 allow us to write byte array literals more easily, please?

Here's how I can do it for now:
```
private val SERVICE_DATA_MASK = byteArrayOf(0xFF.toByte(), 0xFF.toByte(),
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
)
```

Here's how I'd like to do it:
```
private val SERVICE_DATA_MASK = [0xFF_FF_00_00_00_00_00_00_00_00_00_00_00_00]
```
I'd also enjoy being able to omit the first hex character of a byte if it's zero to shorten it further:
```
private val SERVICE_DATA_MASK = [0xFF_FF_0_0_0_0_0_0_0_0_0_0_0_0]
```
What do you think about this? Anyone has a better syntax proposal?