message: Fix buffer overflow in FileDownlink
diff: #include <Fw/Types/Assert.hpp>
  #include <Fw/Types/BasicTypes.hpp>
  #include <Fw/Types/EightyCharString.hpp>
  +#include <Fw/Types/StringUtils.hpp>
  namespace Svc {
  @@ -172,8 +173,8 @@ namespace Svc {
  FW_ASSERT(sourceFilename.length() < sizeof(entry.srcFilename));
  FW_ASSERT(destFilename.length() < sizeof(entry.destFilename));
  - memcpy(entry.srcFilename, sourceFilename.toChar(), sizeof(entry.srcFilename));
  - memcpy(entry.destFilename, destFilename.toChar(), sizeof(entry.destFilename));
  + Fw::StringUtils::string_copy(entry.srcFilename, sourceFilename.toChar(), sizeof(entry.srcFilename));
  + Fw::StringUtils::string_copy(entry.destFilename, destFilename.toChar(), sizeof(entry.destFilename));
  Os::Queue::QueueStatus status = fileQueue.send((U8 *) &entry, sizeof(entry), 0, Os::Queue::QUEUE_NONBLOCKING);
  @@ -245,8 +246,8 @@ namespace Svc {
  FW_ASSERT(sourceFilename.length() < sizeof(entry.srcFilename));
  FW_ASSERT(destFilename.length() < sizeof(entry.destFilename));
  - memcpy(entry.srcFilename, sourceFilename.toChar(), sizeof(entry.srcFilename));
  - memcpy(entry.destFilename, destFilename.toChar(), sizeof(entry.destFilename));
  + Fw::StringUtils::string_copy(entry.srcFilename, sourceFilename.toChar(), sizeof(entry.srcFilename));
  + Fw::StringUtils::string_copy(entry.destFilename, destFilename.toChar(), sizeof(entry.destFilename));
  Os::Queue::QueueStatus status = fileQueue.send((U8 *) &entry, sizeof(entry), 0, Os::Queue::QUEUE_NONBLOCKING);
  @@ -278,8 +279,8 @@ namespace Svc {
  FW_ASSERT(sourceFilename.length() < sizeof(entry.srcFilename));
  FW_ASSERT(destFilename.length() < sizeof(entry.destFilename));
  - memcpy(entry.srcFilename, sourceFilename.toChar(), sizeof(entry.srcFilename));
  - memcpy(entry.destFilename, destFilename.toChar(), sizeof(entry.destFilename));
  + Fw::StringUtils::string_copy(entry.srcFilename, sourceFilename.toChar(), sizeof(entry.srcFilename));
  + Fw::StringUtils::string_copy(entry.destFilename, destFilename.toChar(), sizeof(entry.destFilename));
  Os::Queue::QueueStatus status = fileQueue.send((U8 *) &entry, sizeof(entry), 0, Os::Queue::QUEUE_NONBLOCKING);
  