Remove qmake build files

Removes qmake as a build system for building Qt Creator itself.
Keep them for some tests that are not completely moved to CMake yet.

Change-Id: I846c6ef65626b6dfae6375fdc85d00677aa8c2fb
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/ctfvisualizer/ctfvisualizer.pro

@@ -1,34 +0,0 @@
-TARGET = CtfVisualizer
-TEMPLATE = lib
-
-QT += quick quickwidgets
-
-include(../../qtcreatorplugin.pri)
-include(ctfvisualizer_dependencies.pri)
-
-DEFINES += CTFVISUALIZER_LIBRARY
-
-# CtfVisualizer files
-
-SOURCES += \
-    ctfstatisticsmodel.cpp \
-    ctfstatisticsview.cpp \
-    ctfvisualizerplugin.cpp \
-    ctfvisualizertool.cpp \
-    ctftimelinemodel.cpp \
-    ctftracemanager.cpp \
-    ctfvisualizertraceview.cpp
-
-HEADERS += \
-    ctfstatisticsmodel.h \
-    ctfstatisticsview.h \
-    ctfvisualizerplugin.h \
-    ctfvisualizertool.h\
-    ctftimelinemodel.h \
-    ctftracemanager.h \
-    ctfvisualizerconstants.h \
-    ctfvisualizertraceview.h \
-    ../../libs/3rdparty/json/json.hpp
-
-OTHER_FILES += \
-    CtfVisualizer.json.in

src/plugins/ctfvisualizer/ctfvisualizer_dependencies.pri

@@ -1,8 +0,0 @@
-QTC_PLUGIN_NAME = CtfVisualizer
-
-QTC_LIB_DEPENDS += \
-    utils \
-    tracing
-
-QTC_PLUGIN_DEPENDS += \
-    debugger