REORG: include: move hpack*.h to haproxy/ and split hpack-tbl

The various hpack files are self-contained, but hpack-tbl was one of
those showing difficulties when pools were added because that began
to add quite some dependencies. Now when built in standalone mode,
it still uses the bare minimum pool definitions and doesn't require
to know the prototypes anymore when only the structures are needed.
Thus the files were moved verbatim except for hpack-tbl which was
split between types and prototypes.
diff --git a/src/hpack-dec.c b/src/hpack-dec.c
index aa73f9b..8f8e02b 100644
--- a/src/hpack-dec.c
+++ b/src/hpack-dec.c
@@ -31,9 +31,9 @@
 #include <string.h>
 
 #include <common/standard.h>
-#include <common/hpack-dec.h>
-#include <common/hpack-huff.h>
-#include <common/hpack-tbl.h>
+#include <haproxy/hpack-dec.h>
+#include <haproxy/hpack-huff.h>
+#include <haproxy/hpack-tbl.h>
 #include <haproxy/chunk.h>
 #include <common/h2.h>
 #include <import/ist.h>
diff --git a/src/hpack-enc.c b/src/hpack-enc.c
index 21e28f6..62c6652 100644
--- a/src/hpack-enc.c
+++ b/src/hpack-enc.c
@@ -30,7 +30,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include <common/hpack-enc.h>
+#include <haproxy/hpack-enc.h>
 #include <haproxy/http-hdr-t.h>
 #include <import/ist.h>
 
diff --git a/src/hpack-huff.c b/src/hpack-huff.c
index 19ea163..005dcc4 100644
--- a/src/hpack-huff.c
+++ b/src/hpack-huff.c
@@ -30,7 +30,7 @@
 #include <string.h>
 
 #include <haproxy/api.h>
-#include <common/hpack-huff.h>
+#include <haproxy/hpack-huff.h>
 
 struct huff {
 	uint32_t c; /* code point */
diff --git a/src/hpack-tbl.c b/src/hpack-tbl.c
index 31c24b2..8c56a0d 100644
--- a/src/hpack-tbl.c
+++ b/src/hpack-tbl.c
@@ -30,8 +30,8 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include <common/hpack-huff.h>
-#include <common/hpack-tbl.h>
+#include <haproxy/hpack-huff.h>
+#include <haproxy/hpack-tbl.h>
 #include <import/ist.h>
 
 #include <types/global.h>
diff --git a/src/mux_h2.c b/src/mux_h2.c
index 8c72f81..adc789a 100644
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -15,9 +15,9 @@
 #include <common/cfgparse.h>
 #include <haproxy/h1.h>
 #include <common/h2.h>
-#include <common/hpack-dec.h>
-#include <common/hpack-enc.h>
-#include <common/hpack-tbl.h>
+#include <haproxy/hpack-dec.h>
+#include <haproxy/hpack-enc.h>
+#include <haproxy/hpack-tbl.h>
 #include <haproxy/htx.h>
 #include <haproxy/net_helper.h>
 #include <proto/connection.h>