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/python/python.pro

@@ -1,33 +0,0 @@
-include(../../qtcreatorplugin.pri)
-
-DEFINES += \
-    PYTHON_LIBRARY
-
-HEADERS += \
-    pythonconstants.h \
-    pythoneditor.h \
-    pythonformattoken.h \
-    pythonhighlighter.h \
-    pythonindenter.h \
-    pythonlanguageclient.h \
-    pythonplugin.h \
-    pythonproject.h \
-    pythonrunconfiguration.h \
-    pythonscanner.h \
-    pythonsettings.h \
-    pythonutils.h \
-
-SOURCES += \
-    pythoneditor.cpp \
-    pythonhighlighter.cpp \
-    pythonindenter.cpp \
-    pythonlanguageclient.cpp \
-    pythonplugin.cpp \
-    pythonproject.cpp \
-    pythonrunconfiguration.cpp \
-    pythonscanner.cpp \
-    pythonsettings.cpp \
-    pythonutils.cpp \
-
-RESOURCES += \
-    python.qrc

src/plugins/python/python_dependencies.pri

@@ -1,10 +0,0 @@
-QTC_PLUGIN_NAME = Python
-QTC_LIB_DEPENDS += \
-    extensionsystem \
-    qmljs \
-    utils
-QTC_PLUGIN_DEPENDS += \
-    coreplugin \
-    languageclient \
-    projectexplorer \
-    texteditor