First steps towards removing glib dependencies

- remove the build flags and libraries from the Makefile / Configure.mk
- remove the glib types (gboolean, gchar, gint64, gint)
- comment out / hack around gettext
- replace the glib file helper functions
- replace g_ascii_strtod
- replace g_build_filename
- use environment variables instead of g_get_home_dir() & g_get_user_name()
- comment out GPS string parsing (uses glib utf8 macros)

This needs massive cleanup, but it's a snapshot of what I have right now, in
case people want to look at it.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

main.cpp

@@ -18,6 +18,7 @@ int main(int argc, char **argv)
 {
 	int i;
 	bool no_filenames = true;
+#if 0
 	const char *path;
 
 	/* set up l18n - the search directory needs to change
@@ -28,7 +29,7 @@ int main(int argc, char **argv)
 	bindtextdomain("subsurface", path);
 	bind_textdomain_codeset("subsurface", "utf-8");
 	textdomain("subsurface");
-
+#endif
 	setup_system_prefs();
 	prefs = default_prefs;