Unify sysinfo plugins and add osx support

This does remove the net* commands from the
Unix version that may return at a later date
with OSX and Windows support.

This commit also makes numerious other changes
such as code cleanup, reformatting, etc.

Closes #829

plugins/sysinfo/sysinfo-backend.h

@@ -0,0 +1,33 @@
+/*
+ * SysInfo - sysinfo plugin for HexChat
+ * Copyright (c) 2015 Patrick Griffis.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+
+#ifndef SYSINFO_BACKEND_H
+#define SYSINFO_BACKEND_H
+
+char *sysinfo_backend_get_os(void);
+char *sysinfo_backend_get_disk(void);
+char *sysinfo_backend_get_memory(void);
+char *sysinfo_backend_get_cpu(void);
+char *sysinfo_backend_get_gpu(void);
+char *sysinfo_backend_get_sound(void);
+char *sysinfo_backend_get_uptime(void);
+char *sysinfo_backend_get_network(void);
+
+#endif