HIDPP/WTP: remove ununsed EVENT_TOUCHPAD_RAW_XY_

Was written in the spec, but never used by devices
WTP: remove WTP_QUIRK_MANUAL_RESOLUTION

We can detect it, so detect it
WTP: reorder input_mt_init_slots

input_mt_init_slots should be called after the initialization of the axes,
thus it creates ABS_X|Y with the right parameters
HIDPP/WTP: remove force_vs_area parameter

+ extracts wtp_set_raw_mode()
HIDPP: split HID_GROUP_LOGITECH_DJ_* definitions
WTP: fix max pressure

The devices do not give us valuable information regarding the pressure
range. Using 50 as a value seems to be ok (though some values are
exceeding this max)