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/compilationdatabaseprojectmanager/compilationdatabaseprojectmanager.pro

@@ -1,24 +0,0 @@
-include(../../qtcreatorplugin.pri)
-
-SOURCES = \
-    compilationdatabaseproject.cpp \
-    compilationdatabaseprojectmanagerplugin.cpp \
-    compilationdatabaseutils.cpp \
-    compilationdbparser.cpp
-
-HEADERS = \
-    compilationdatabaseproject.h \
-    compilationdatabaseprojectmanagerplugin.h \
-    compilationdatabaseconstants.h \
-    compilationdatabaseutils.h \
-    compilationdbparser.h
-
-equals(TEST, 1) {
-    HEADERS += \
-        compilationdatabasetests.h
-
-    SOURCES += \
-        compilationdatabasetests.cpp
-
-    RESOURCES += compilationdatabasetests.qrc
-}

src/plugins/compilationdatabaseprojectmanager/compilationdatabaseprojectmanager_dependencies.pri

@@ -1,10 +0,0 @@
-QTC_PLUGIN_NAME = CompilationDatabaseProjectManager
-
-QTC_LIB_DEPENDS += \
-    extensionsystem \
-    utils
-QTC_PLUGIN_DEPENDS += \
-    coreplugin \
-    cppeditor \
-    projectexplorer \
-    texteditor