Some more small clarifications of shared processor implementation.

Signed-off-by: Adrian.Conlon <adrian.conlon@gmail.com>

Z80/inc/Z80.h

@@ -54,7 +54,7 @@ namespace EightBit {
 
 		int interrupt(bool maskable, uint8_t value);
 
-		int execute(uint8_t opcode);
+		virtual int execute(uint8_t opcode);
 		int step();
 
 		virtual register16_t& AF() override {
@@ -131,9 +131,9 @@ namespace EightBit {
 		int8_t m_displacement;
 		bool m_displaced;
 
-		int fetchExecute() {
+		virtual int fetchExecute() override{
 			M1() = true;
-			return execute(fetchByte());
+			return IntelProcessor::fetchExecute();
 		}
 
 		uint8_t& DISPLACED() {

Z80/src/Z80.cpp

@@ -1152,7 +1152,7 @@ void EightBit::Z80::executeOther(int x, int y, int z, int p, int q) {
 		case 1:	// 16-bit load immediate/add
 			switch (q) {
 			case 0: // LD rp,nn
-				fetchWord(RP(p));
+				Processor::fetchWord(RP(p));
 				cycles += 10;
 				break;
 			case 1:	// ADD HL,rp