1.36
- Finally worked out why the menu items weren't being highlighted in several
  ROMs, including Battletoads, U.N. Squadron and All Japan Pro Wrestling.
  Two problems: its seems the SNES does halve the colour value result when
  blending colours when only the fixed colour addition/subtraction is enabled,
  but doesn't halve the result when sub-screen is being blended and its a clear
  part of the sub-screen. The second problem was that I had an optimisation
  that prevented the time consuming colour blending code from being called if
  the colour being added/subtracted was black - adding zero to a number doesn't
  affect the result, but not performing the side-effect of halving the result
  does affect the final value...
- Super Formation Soccer 95 requires that the DMA enabled register doesn't
  always return zero, otherwise the game locks up.
- Thanks to several people reporting a screen flickering problem in the
  pseudo 3-d section of Jurassic Park 2 I've fixed a nasty problem in H-IRQ
  handling code which could cause double-triggers or skip IRQs altogether.
  With this fix I can now remove the special hacks for Ninja Warriors Again,
  Chuck Rock and F-1 Grand Prix.
	
- More games needing the slow SPC700 timing:
  Zennihon Puroresu 2, Soulblazer and Robotrek.
- The CPU idle time skipping code was skipping cycles during a software delay
  loop in Itchy and Scratchy, causing screen flicker.
- Looks like reading the value of register $2137 shouldn't clear a pending
  IRQ - was causing screen flicker on Yoshi's Island.
- Actraiser 1 & 2 both need the slow SPC700 timing.
- Terranigma reads a sound channel's current sample output value and waits for
  it to be zero before preceeding. I forgot to always return zero when a
  channel was silent. This mistake was causing the game to lock up.
   + Itchy and Scratchy and was causing the music to stop and samples to be cut
     short in the Mario Early Years series.
- Added a hack for Secret of the Evermore - at several points in the game, just
  as the plane is about to land, it reads from unknown registers $4000 and
  $4001 and, if it doesn't get the value its looking for, the game hangs or
  displays corrupt graphics.
- Silva Saga 2 was accidentally triggering a colour blending hack I put in
  place Kirby Dreamland 3 and Kirby Superstar.
- The ZSNES freeze-file loading code could leave a file open if the file wasn't
  a valid ZSNES freeze file.
- Super Punch-out requires certain DMA registers to be updated after the DMA
  completes. Snes9x used to do that, but I must have accidentally left the code
  commented out whilst investigating a different problem in another game.