Move functions and API needed by the plugins to the src_common directory

src_common/caller_api.h

@@ -0,0 +1,34 @@
+/*******************************************************************************
+ *   Ledger Ethereum App
+ *   (c) 2016-2019 Ledger
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ ********************************************************************************/
+
+#pragma once
+
+#ifdef HAVE_NBGL
+#include "ux.h"
+#endif
+
+typedef enum { CALLER_TYPE_CLONE, CALLER_TYPE_PLUGIN } e_caller_type;
+
+typedef struct caller_app_t {
+    const char *name;
+#ifdef HAVE_NBGL
+    const nbgl_icon_details_t *icon;
+#endif
+    char type;  // does not have to be set by the caller app
+} caller_app_t;
+
+extern caller_app_t *caller_app;