Cleanup: remove IConsoleWarning/IConsoleError helpers

Both did not support format parameters, so in many places IConsolePrint(CC_ERROR, "message") was used with a style different from what IConsoleError would do.

src/console.cpp

@@ -144,26 +144,6 @@ void CDECL IConsolePrintF(TextColour colour_code, const char *format, ...)
 	IConsolePrint(colour_code, buf);
 }
 
-/**
- * It is possible to print warnings to the console. These are mostly
- * errors or mishaps, but non-fatal. You need at least a level 1 (developer) for
- * debugging messages to show up
- */
-void IConsoleWarning(const char *string)
-{
-	if (_settings_client.gui.developer == 0) return;
-	IConsolePrintF(CC_WARNING, "WARNING: %s", string);
-}
-
-/**
- * It is possible to print error information to the console. This can include
- * game errors, or errors in general you would want the user to notice
- */
-void IConsoleError(const char *string)
-{
-	IConsolePrintF(CC_ERROR, "ERROR: %s", string);
-}
-
 /**
  * Change a string into its number representation. Supports
  * decimal and hexadecimal numbers as well as 'on'/'off' 'true'/'false'

src/console_func.h

@@ -47,8 +47,6 @@ static inline void IConsolePrint(TextColour colour_code, const T &format, A firs
 }
 
 void CDECL IConsolePrintF(TextColour colour_code, const char *format, ...) WARN_FORMAT(2, 3);
-void IConsoleWarning(const char *string);
-void IConsoleError(const char *string);
 
 /* Parser */
 void IConsoleCmdExec(const char *cmdstr, const uint recurse_count = 0);