Adds gemmasdl2

-> needs work but starts and runs and steps through the 1-chip8
 -> has debugging level code for determining what buttons are being pushed

gemma/src/chip8/instructions.rs

@@ -681,8 +681,6 @@ impl Chip8CpuInstructions {
 
                 input.registers.poke(0xf, target);
 
-
-
             }
             Chip8CpuInstructions::SkpVx(x) => {
                 // Ex9E - SKP Vx

gemma/src/constants.rs

@@ -10,4 +10,5 @@ pub const CHIP8_KEYBOARD: [[u8; 4]; 4] = [
     [0x04, 0x05, 0x06, 0x0D],
     [0x07, 0x08, 0x09, 0x0E],
     [0x0A, 0x00, 0x0B, 0x0F]
-];
+];
+