Added .DEFINEDMACRO psuedo function

Fixed typo/fomatting

Formatting fix

Refactor the code to test for a macro

Remove .FEATURE requirement for .DEFINEDMACRO

src/ca65/global.c

@@ -83,3 +83,4 @@ unsigned char CComments          = 0;   /* Allow C like comments */
 unsigned char ForceRange         = 0;   /* Force values into expected range */
 unsigned char UnderlineInNumbers = 0;   /* Allow underlines in numbers */
 unsigned char AddrSize           = 0;   /* Allow .ADDRSIZE function */
+