Try to correct "one definition rule" problems:

1) No forward declarations
2) No virtual methods defined inline.

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

src/IntelProcessor.cpp

@@ -16,4 +16,26 @@ void EightBit::IntelProcessor::initialise() {
 void EightBit::IntelProcessor::reset() {
 	Processor::reset();
 	SP().word = AF().word = BC().word = DE().word = HL().word = Mask16;
-}
+}
+
+void EightBit::IntelProcessor::push(uint8_t value) {
+	setByte(--SP().word, value);
+}
+
+uint8_t EightBit::IntelProcessor::pop() {
+	return getByte(SP().word++);
+}
+
+void EightBit::IntelProcessor::getWordViaMemptr(register16_t& value) {
+	memptrReference();
+	value.low = getByte();
+	BUS().ADDRESS().word++;
+	value.high = getByte();
+}
+
+void EightBit::IntelProcessor::setWordViaMemptr(register16_t value) {
+	memptrReference();
+	setByte(value.low);
+	BUS().ADDRESS().word++;
+	setByte(value.high);
+}

src/Processor.cpp

@@ -28,3 +28,18 @@ int EightBit::Processor::run(int limit) {
 int EightBit::Processor::singleStep() {
 	return step();
 }
+
+uint8_t EightBit::Processor::fetchByte() {
+	return getByte(PC().word++);
+}
+
+void EightBit::Processor::fetchWord(register16_t& output) {
+	output.low = fetchByte();
+	output.high = fetchByte();
+}
+
+int EightBit::Processor::fetchExecute() {
+	if (!powered())
+		return 0;
+	return execute(fetchByte());
+}