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/qmlpreview/qmlpreview.pro

@@ -1,28 +0,0 @@
-DEFINES += QMLPREVIEW_LIBRARY
-
-include(../../qtcreatorplugin.pri)
-include(qmlpreview_dependencies.pri)
-
-equals(TEST, 1) {
-include(tests/tests.pri)
-}
-
-HEADERS += \
-    qmlpreview_global.h \
-    qmldebugtranslationclient.h \
-    qmlpreviewclient.h \
-    qmlpreviewplugin.h \
-    qmlpreviewruncontrol.h \
-    qmlpreviewconnectionmanager.h \
-    qmlpreviewfileontargetfinder.h
-
-SOURCES += \
-    qmlpreviewplugin.cpp \
-    qmldebugtranslationclient.cpp \
-    qmlpreviewclient.cpp \
-    qmlpreviewruncontrol.cpp \
-    qmlpreviewconnectionmanager.cpp \
-    qmlpreviewfileontargetfinder.cpp
-
-OTHER_FILES += \
-    QmlPreview.json.in

src/plugins/qmlpreview/qmlpreview_dependencies.pri

@@ -1,14 +0,0 @@
-QTC_PLUGIN_NAME = QmlPreview
-QTC_LIB_DEPENDS += \
-    extensionsystem \
-    qmldebug \
-    qmljs \
-    utils
-
-QTC_PLUGIN_DEPENDS += \
-    coreplugin \
-    projectexplorer \
-    qmljstools \
-    qtsupport \
-    resourceeditor \
-    qmlprojectmanager

src/plugins/qmlpreview/tests/tests.pri

@@ -1,7 +0,0 @@
-SOURCES += \
-    $$PWD/qmlpreviewclient_test.cpp \
-    $$PWD/qmlpreviewplugin_test.cpp
-
-HEADERS += \
-    $$PWD/qmlpreviewclient_test.h \
-    $$PWD/qmlpreviewplugin_test.h