Remove Tiling support from KWin

Review Request #105546 - Created July 13, 2012 and submitted - Latest diff uploaded

Martin Gräßlin
Remove Tiling support from KWin

As discussed on the mailinglist [1] the tiling support is
removed from KWin. The main reasons for this step are:
* it is unmaintained
* it is a mode not used by any of the core KWin team
* original developer said at Akademy 2012 that he is not
  interested in picking up the work again
* tiling has quite some bugs, e.g. multi screen not supported
* is conflicting with other concepts in KWin, e.g. activities

There is ongoing work to get tiling supported through a KWin
script, which is a preferred way as it does not influence the
existing C++ code base.

BUG: 303090
FIXED-IN: 4.10
REVIEW: 105546
it compiles, thanks to the existing build option it should be pretty safe