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/qmlprojectmanager/fileformat/fileformat.pri

@@ -1,6 +0,0 @@
-HEADERS += $$PWD/qmlprojectitem.h \
-           $$PWD/filefilteritems.h \
-           $$PWD/qmlprojectfileformat.h
-SOURCES += $$PWD/qmlprojectitem.cpp \
-           $$PWD/filefilteritems.cpp \
-           $$PWD/qmlprojectfileformat.cpp

src/plugins/qmlprojectmanager/qmlprojectmanager.pro

@@ -1,27 +0,0 @@
-QT += network
-
-include(../../qtcreatorplugin.pri)
-include(fileformat/fileformat.pri)
-
-DEFINES += QMLPROJECTMANAGER_LIBRARY
-
-HEADERS += \
-    qmlmainfileaspect.h \
-    qmlmultilanguageaspect.h \
-    qmlproject.h \
-    qmlprojectplugin.h \
-    qmlprojectconstants.h \
-    qmlprojectnodes.h \
-    qmlprojectrunconfiguration.h \
-    qmlprojectmanager_global.h \
-    qmlprojectmanagerconstants.h
-
-SOURCES += \
-    qmlmainfileaspect.cpp \
-    qmlmultilanguageaspect.cpp \
-    qmlproject.cpp \
-    qmlprojectplugin.cpp \
-    qmlprojectnodes.cpp \
-    qmlprojectrunconfiguration.cpp
-
-RESOURCES += qmlproject.qrc

src/plugins/qmlprojectmanager/qmlprojectmanager_dependencies.pri

@@ -1,9 +0,0 @@
-QTC_PLUGIN_NAME = QmlProjectManager
-QTC_LIB_DEPENDS += \
-    extensionsystem \
-    qmljs \
-    utils
-QTC_PLUGIN_DEPENDS += \
-    coreplugin \
-    projectexplorer \
-    qtsupport