[Development] Removing Wacom support in Qt5

[Ariel Molina]

> Feel free to scratch the code if the itch is bugging you!
This is the point, in a couple of years, few people are being
scraching *that* code, that's the reason of the state of the code.
Many users will never find the bug, 'cause the do not own, or share a
computer with a Wacom tablet. So this bug seems rare, but as Quick
evolves it will become common.

Anyway, I want to bring back attention that this bug affects even Qt
development tools, i can reproduce it in at least 40 computers where
the sole presence of the Wacom drivers makes QtC and most apps almost
unusable due to the "driver" errors and general slugginesh.

And bringing back the proposed solutions. Please dont say, "go on and
fix it", I wont, 'cause I don't know how, but mainly I do not care
about Wacom (as a high % of people), I care about Qt and Quick general
and if Wacom issues are this severe and affect the whole GUI/Quick
modules my guess is that at least 1) or 2) are not that developer-time
consuming.

1) Setup a flag similar to WA_AcceptTouchEvents
2) Create a commandline  --enable-wacom
3) Remove Wacom altogether

OTOH I have few resources to offer more that the bug reporting and
testing on the 40+ workstations i have.

Ariel