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++/src/Commands/WaitCommand.cpp

@@ -15,7 +15,7 @@ WaitCommand::WaitCommand(double timeout)
               .c_str(),
           timeout) {}
 
-WaitCommand::WaitCommand(const char *name, double timeout)
+WaitCommand::WaitCommand(const std::string &name, double timeout)
     : Command(name, timeout) {}
 
 void WaitCommand::Initialize() {}