lib: Major rewrite of the libfprint core and API

This is a rewrite of the core based on GObject and Gio. This commit
breaks the build in a lot of ways, but basic functionality will start
working again with the next commits.

libfprint/fpi-context.h

@@ -0,0 +1,33 @@
+/*
+ * FpContext - A FPrint context
+ * Copyright (C) 2019 Benjamin Berg <bberg@redhat.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#pragma once
+
+#include <gusb.h>
+#include "fp-context.h"
+
+/**
+ * fpi_get_driver_types:
+ * @drivers: #GArray to be filled with all driver types
+ *
+ * This function is purely for private used. It is solely part of the public
+ * API as it is useful during build time.
+ *
+ * Stability: private
+ */
+void fpi_get_driver_types (GArray *drivers);