POC - Combining BW Clock and Desktop Launcher to spend less time "Loading..."

I just pushed some changes to the development app loader to enable an app cache in the default launcher.

• In a default-ish install it brings the startup time down from 0.46s to 0.36s
  
• I installed a few extra apps and it came down from 0.57s to 0.39s (it scales much better)
  
  

And if you're switching apps so not reloading widgets it's even faster (0.25s). I feel like the same changes could be pulled into other launchers pretty easily too, and would go a long way towards improving the app switching times when there are a lot of apps installed.

Maybe we should add a debug bootloader that logs per-bootfile timings to the console on boot?

Try this: https://gist.github.com/gfwilliams/95f776176929b58b3603034065c3ec2d

Seems to work ok, by default I'm seeing:

init 0.06207275390
health.boot.js 0.01016235351
sched.boot.js 0.01272583007
welcome.boot.js 0.00277709960

So not too bad at all.