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/help/help.pro

@@ -1,89 +0,0 @@
-QT += help network printsupport sql
-
-INCLUDEPATH += $$PWD
-
-include(../../qtcreatorplugin.pri)
-
-minQtVersion(5, 15, 0) {
-DEFINES += HELP_NEW_FILTER_ENGINE
-}
-
-DEFINES += \
-    QT_CLUCENE_SUPPORT \
-    HELP_LIBRARY
-
-HEADERS += \
-    docsettingspage.h \
-    filtersettingspage.h \
-    generalsettingspage.h \
-    helpconstants.h \
-    helpfindsupport.h \
-    helpindexfilter.h \
-    localhelpmanager.h \
-    helpmanager.h \
-    helpmode.h \
-    helpplugin.h \
-    helpviewer.h \
-    openpagesmanager.h \
-    openpagesswitcher.h \
-    openpageswidget.h \
-    searchwidget.h \
-    xbelsupport.h \
-    searchtaskhandler.h \
-    textbrowserhelpviewer.h \
-    helpwidget.h
-
-SOURCES += \
-    docsettingspage.cpp \
-    filtersettingspage.cpp \
-    generalsettingspage.cpp \
-    helpfindsupport.cpp \
-    helpindexfilter.cpp \
-    localhelpmanager.cpp \
-    helpmanager.cpp \
-    helpmode.cpp \
-    helpplugin.cpp \
-    helpviewer.cpp \
-    openpagesmanager.cpp \
-    openpagesswitcher.cpp \
-    openpageswidget.cpp \
-    searchwidget.cpp \
-    xbelsupport.cpp \
-    searchtaskhandler.cpp \
-    textbrowserhelpviewer.cpp \
-    helpwidget.cpp
-
-FORMS += docsettingspage.ui \
-    filtersettingspage.ui \
-    generalsettingspage.ui
-
-!isEmpty(QT.webenginewidgets.name) {
-    QT += webenginewidgets
-    HEADERS += webenginehelpviewer.h
-    SOURCES += webenginehelpviewer.cpp
-    DEFINES += QTC_WEBENGINE_HELPVIEWER
-}
-
-osx {
-    DEFINES += QTC_MAC_NATIVE_HELPVIEWER
-    HEADERS += macwebkithelpviewer.h
-    OBJECTIVE_SOURCES += macwebkithelpviewer.mm
-    LIBS += -framework WebKit -framework AppKit
-
-    !isEmpty(USE_QUICK_WIDGET) {
-        DEFINES += QTC_MAC_NATIVE_HELPVIEWER_DEFAULT
-    }
-}
-
-QLITEHTML_DIR = $$PWD/../../libs/qlitehtml
-exists($$QLITEHTML_DIR/src/qlitehtml.pri) {
-    exists($$QLITEHTML_DIR/src/3rdparty/litehtml/CMakeLists.txt)|!isEmpty(LITEHTML_INSTALL_DIR) {
-        include($$QLITEHTML_DIR/src/qlitehtml.pri)
-        HEADERS += litehtmlhelpviewer.h
-        SOURCES += litehtmlhelpviewer.cpp
-        DEFINES += QTC_LITEHTML_HELPVIEWER
-    }
-}
-
-RESOURCES += help.qrc
-include(../../shared/help/help.pri)

src/plugins/help/help_dependencies.pri

@@ -1,10 +0,0 @@
-QTC_PLUGIN_NAME = Help
-QTC_LIB_DEPENDS += \
-    aggregation \
-    extensionsystem \
-    utils
-QTC_PLUGIN_DEPENDS += \
-    coreplugin \
-    projectexplorer
-QTC_PLUGIN_RECOMMENDS += \
-    texteditor