OswAppDrawer (better app-switcher UI)

[simonmicro]

We noted several problems with the current UI:

Problems

• Apps tend to use all three buttons - especially the currently needed button-1 long-/short-press -> reduce it to just button-1 long-press
• Many apps? Horrible. You have to scroll through to get to the right one - which IS AWFULLY SLOW! -> a select-your-app ui?
• No overview about which apps are available -> a select-your-app ui?

Solution!

• [x] app-drawer (replaces switcher with interactive, categorized menu of apps with icons)
  • [x] late-init of apps for app-drawer
    • [x] container, with get()-able pointer to instance
    • [x] apps constructed only created as needed
    • [x] cleaned-up upon app section
    • [x] has (OswAppV2*)() pointers to init functions for app-instances
  • [x] sleep-persistance -> store "index" of last selected app and recover from deep-sleep to that app
• [x] ~allow override of getButtonStateMask, so the drawer can pass through the app and patch-in itself~ -> solved by using the apps own button logic as wrapper
• [x] remove old switcher

Nice-to-have

• [x] ~animations!~ -> got the classic ones, but I plan not to add many more for now...

[simonmicro]

Sneek-peek: The new app-drawer. Here I've used two dummy categories "OswAppV1"/"OswAppV2", each with one app (the example apps, as I have not ported the rest) in them. At the bottom is the name of the selected app. Navigation works with up/down (changes category/app) and the icons are obviously placeholders...

...and we even have paging-support (just added the example-app-v1 some more times)...