Changed const char* -> string in most of wpilibc.

The HAL will remain untouched in order to maintain C-style
compatibility. A few places in wpilibc were left as
C-style strings, especially if special formatting (eg,
elaborate uses of snprintf or sscanf) was being used.

In general, const char* was changed to std::string.
character buffers used for formatting were either
untouched, changed to std::stringstream, or changed
to std::string, depending on what was done with
the buffer.

Change-Id: I5e431ddf1cc4d9a6d534e1f21b16ea23be26e7f1

wpilibc/wpilibC++Devices/src/Task.cpp

@@ -91,7 +91,7 @@ bool Task::SetPriority(int32_t priority) {
 
 /**
  * Returns the name of the task.
- * @returns Pointer to the name of the task or nullptr if not allocated
+ * @returns The name of the task (0 length if not allocated).
  */
 std::string Task::GetName() const { return m_taskName; }