Add a proper build system

Also lowers the minimum required Qt version to 5.5.

src/QtCore/QtCoreApplication.h

@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2017, Jonathan Schleifer <js@heap.zone>
+ *
+ * https://heap.zone/git/objqt.git
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice is present in all copies.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import "QtObject.h"
+
+#include <QCoreApplication>
+
+@interface QtCoreApplication: QtObject
+@property (readonly) QCoreApplication *qCoreApplication;
+@property (copy) OFString *applicationName, *applicationVersion;
+@property (copy) OFString *organizationDomain, *organizationName;
+@property (getter=isQuitLockEnabled) bool quitLockEnabled;
+
+- initWithQCoreApplication: (QCoreApplication*)qCoreApplication;
+- (void)installNativeEventFilter: (QAbstractNativeEventFilter*)filterObject;
+- (void)quit;
+- (void)removeNativeEventFilter: (QAbstractNativeEventFilter*)filterObject;
+- (bool)sendEvent: (QtEvent*)event
+	 receiver: (QtObject*)receiver;
+@end
+
+namespace ObjQt {
+
+static OF_INLINE QtCoreApplication*
+toOF(QCoreApplication *qCoreApplication)
+{
+	return [[[QtCoreApplication alloc]
+	    initWithQCoreApplication: qCoreApplication] autorelease];
+}
+
+static OF_INLINE QCoreApplication*
+toQt(QtCoreApplication *coreApplication)
+{
+	return [coreApplication qCoreApplication];
+}
+
+}