Implement tap gesture.

Change everything to use float, add vec2 functions.

Fix bad logic in wl_seat_capabilities.

Fix upside-down icons, implement scaling.

Implement kinetic scrolling

Fix last_x -> last_y typo

Signed-off-by: Tom Lebreux <tomlebreux@cock.li>

Remove unnecessary statements

Render icons with OpenGL :D

Add libdrm dependency to meson.build

Lower gesture completion threshold 25%

Set minimum animation duration

This throttles user input to make things feel a bit better, and
finishes the animation if the user finishes their gesture before it
completes.

Add cairo prerendering and shaders compilation

Four column layout

Make drawer open state use darker background

When opened, stay open, and implement close

Render grid of "icons"

Render background with respect to progress

Complete buffer deallocation

Complete buffer allocation

Better separation of concerns