include: reorganize headers file to include/osmocom/[gsm|core]

This patch moves all GSM-specific definitions to include/osmocom/gsm.
Moreover, the headers in include/osmocore/ have been moved to
include/osmocom/core.

This has been proposed by Harald Welte and Sylvain Munaunt.

Tested with `make distcheck'.

Signed-off-by: Pablo Neira Ayuso <pablo@gnumonks.org>
diff --git a/src/vty/vector.c b/src/vty/vector.c
index 0343163..4012f24 100644
--- a/src/vty/vector.c
+++ b/src/vty/vector.c
@@ -24,7 +24,7 @@
 
 #include <osmocom/vty/vector.h>
 #include <osmocom/vty/vty.h>
-#include <osmocore/talloc.h>
+#include <osmocom/core/talloc.h>
 #include <memory.h>
 
 void *tall_vty_vec_ctx;