restructuring: windows: find cmd functions from linked list instead of using patterns

[SmileyAG]

To hook cmd functions such as changelevel2 or record it is not necessary to create patterns at all
There is cmd_function_t* cmd_functions global variable in the engine code in which all commands is stored

cmd_function_t structure:

typedef void (*xcommand_t) (void);
typedef struct cmd_function_s
{
	struct cmd_function_s	*next;
	char					*name;
	xcommand_t				function;
	int						flags;
} cmd_function_t;