Review Request 126101: allow loading backends in-process

[Sebastian Kügler]

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https://git.reviewboard.kde.org/r/126101/
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Review request for Plasma, Solid, Aleix Pol Gonzalez, Daniel Vrátil, and Martin Gräßlin.


Repository: libkscreen


Description
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This patchset adds in-process operation to libkscreen

purpose:
- allow easier debugging
- for some backends (qscreen, upcoming kwayland) the out of process operation is not necessary since these backends are well-shielded

This implementation is backwards compatible and should mean only minimal changes to running setups.

If the user exports KSCREEN_BACKEND_INPROCESS=1 before running, all operations will be done in process. Otherwise, the out-of-process mode is used.

The idea is that we use 
The changes in the clients to use the in-process mode are to use ConfigOperation::create() and ConfigOperation::setOperation() to retrieve the get or set config jobs. The rest will be handled inside libkscreen.

Autotests should cover all the cases (and actually a few currently unsupported ones, such as using different backends in the same process).

Details on performance, etc.: http://vizzzion.org/blog/2015/11/wayland-and-libkscreen-benchmarks/


Diffs
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  CMakeLists.txt 86a0965 
  autotests/CMakeLists.txt 69af7f0 
  autotests/testconfigmonitor.cpp a051226 
  autotests/testinprocess.cpp PRE-CREATION 
  autotests/testqscreenbackend.cpp da4dbae 
  autotests/testscreenconfig.cpp ecbcedf 
  backends/fake/fake.cpp 60264dd 
  src/CMakeLists.txt 4b56b61 
  src/backendlauncher/backendloader.cpp 52051df 
  src/backendmanager.cpp ca9c746 
  src/backendmanager_p.h c6418e2 
  src/config.cpp 75d947d 
  src/configmonitor.h b6f1189 
  src/configmonitor.cpp a14bc70 
  src/configoperation.h 2405d79 
  src/configoperation.cpp 87fe141 
  src/getconfigoperation.h c85bfaa 
  src/inprocessconfigoperation.h PRE-CREATION 
  src/inprocessconfigoperation.cpp PRE-CREATION 
  src/output.cpp bd381fa 
  src/setconfigoperation.cpp 6ea944f 
  src/setinprocessoperation.h PRE-CREATION 
  src/setinprocessoperation.cpp PRE-CREATION 

Diff: https://git.reviewboard.kde.org/r/126101/diff/


Testing
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Added a ton of autotests, made sure all existing ones pass.

tried "KSCREEN_BACKEND_INPROCESS=1 kcmshell5 kscreen", all working as expected.


Thanks,

Sebastian Kügler

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