Fix compilation warnings (#216)

* Fix deprecated os_memmove warning

Switched to the standard memmove function

* Fix get_network_ticker implicit declaration warning

Included the required missing header file

* Removed useless execution rights from Makefile

* Fix directory name in README

src/eth_plugin_handler.c

@@ -2,6 +2,7 @@
 #include "eth_plugin_handler.h"
 #include "eth_plugin_internal.h"
 #include "shared_context.h"
+#include "network.h"
 
 void eth_plugin_prepare_init(ethPluginInitContract_t *init, uint8_t *selector, uint32_t dataSize) {
     memset((uint8_t *) init, 0, sizeof(ethPluginInitContract_t));