Fix app manager fail to install large app file issue (#555)

Remove the limit of app file size no larger than 1 MB, fix possible memory leak issues when fail to install app file, change message size of aee_host_msg_callback() from uint16 type to uint32 type to fix possible integer overflow issue, and fix some coding style issues of app manager.

Signed-off-by: Wenyong Huang <wenyong.huang@intel.com>

core/shared/mem-alloc/ems/ems_alloc.c

@@ -570,6 +570,7 @@ gc_realloc_vo_internal(void *vheap, void *ptr, gc_size_t size,
         }
     }
 
+
     hmu = alloc_hmu_ex(heap, tot_size);
     if (!hmu)
         goto finish;