Mobile Shell improvements

[BomberFish]

Changes

• Adds new API: anura.platform
• Adds touch support to AliceWM, with larger titlebars for touchscreen devices.
• Add mobile UI (still a work-in-progress, see screenshot)

Screenshots

Tablet UI

• Notice the larger titlebar icons.

Phone UI

• Only one window allowed at a time, launcher covers whole screen width.

[ProgrammerIn-wonderland]

I know this PR is a joke but tablet support is much appreciated

[ProgrammerIn-wonderland]

I can see iPad kids using this

[BomberFish]

I know this PR is a joke but tablet support is much appreciated

Only really a half joke. Tablet support is legit but phone support is a total joke