Fetching bytes/words and stack access are more processor specific than I thought.

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

src/Processor.cpp

@@ -5,7 +5,6 @@ EightBit::Processor::Processor(Memory& memory)
 : m_memory(memory),
   cycles(0),
   m_halted(false) {
-	SP().word = 0xffff;
 	PC().word = 0;
 }
 
@@ -14,6 +13,5 @@ void EightBit::Processor::reset() {
 }
 
 void EightBit::Processor::initialise() {
-	SP().word = 0xffff;
 	reset();
 }