Enhance the base/rom extension to generate the symbol file of the rom built.
The symbol file is placed in epoc32/rom/<baseport_name>, along with the rom log and final oby file.
+ length=18, type=0x01
>12010002ffffff40220e4000050301020301
+ length=9, type=0x02
>09024a00020104e000
\
+ length=3, type=0x09
>030903
+ length=9, type=0x04
>0904000000ffffff06
+ length=9, type=0x04
>0904010002ffffff07
\
+ length=7, type=0x05
>07050102400000
+ length=7, type=0x05
>07058402400000
/
+ length=9, type=0x04
>0904010103ffffff08
\
+ length=7, type=0x05
>07058103080040
+ length=7, type=0x05
>07050102400000
+ length=7, type=0x05
>07058402400000
/
/