Element restructuring.  Add support for new basic Element types including the RS objects and vectors(2-4).  In theory this paves the way for maintaining type info for RS objects, passing elements for GLSL uiforms/attribs/varyings, and supporting nested structures.

This will break some apps, checkings for other projects will follow to unbreak them.
diff --git a/libs/rs/rsFileA3D.cpp b/libs/rs/rsFileA3D.cpp
index c566665..e3272c5 100644
--- a/libs/rs/rsFileA3D.cpp
+++ b/libs/rs/rsFileA3D.cpp
@@ -324,6 +324,7 @@
 
 void FileA3D::processChunk_Element(Context *rsc, IO *io, A3DIndexEntry *ie)
 {
+    /*
     rsi_ElementBegin(rsc);
 
     uint32_t count = io->loadU32();
@@ -338,6 +339,7 @@
     }
     LOGE("processChunk_Element create");
     ie->mRsObj = rsi_ElementCreate(rsc);
+    */
 }
 
 void FileA3D::processChunk_ElementSource(Context *rsc, IO *io, A3DIndexEntry *ie)