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Add ldi a, [hl] and ldd a, [hl] instructions

These are equivalent to ld a, [hl+] and ld a, [hl-] respectively.

--- a/src/asm/asmy.y

+++ b/src/asm/asmy.y

@@ -1263,11 +1263,15 @@

 					{ out_AbsByte(0x02|(2<<4)); }

 				|	T_Z80_LDI T_MODE_A comma T_MODE_HL

 					{ out_AbsByte(0x0A|(2<<4)); }

+				|	T_Z80_LDI T_MODE_A comma T_MODE_HL_IND

+					{ out_AbsByte(0x0A|(2<<4)); }

 ;

 z80_ldd			:	T_Z80_LDD T_MODE_HL_IND comma T_MODE_A

 					{ out_AbsByte(0x02|(3<<4)); }

 				|	T_Z80_LDD T_MODE_A comma T_MODE_HL

+					{ out_AbsByte(0x0A|(3<<4)); }

+				|	T_Z80_LDD T_MODE_A comma T_MODE_HL_IND

 					{ out_AbsByte(0x0A|(3<<4)); }

 ;