evdev: improve joystick and gamepad detection

evdev: improve joystick and gamepad detection

The EVDEV_UDEV_TAG_JOYSTICK is set when a joystick or gamepad button
is found. However, it can not be used to identify joysticks or
gamepads because there are keyboards that also have it. Even worse,
many joysticks also map KEY_* and thus are tagged as keyboards.

In order to be able to detect joysticks and gamepads and
differentiate them from keyboards, apply the following rules:

  1. The device is tagged as joystick but not as tablet
  2. It has at least 2 joystick buttons
  3. It doesn't have 10 keyboard keys

Fix #701
Fix #415
Fix #703

Signed-off-by: José Expósito <jose.exposito89@gmail.com>