Fix alpha, color transform in adjustColor shader

[inky03]

the adjustColor fragment shader multiplies the color by alpha on the output. the color is already premultiplied by alpha, so this only causes colors to turn darker as the opacity / alpha decreases, causing black edges and making the output look "dirty". this is specially noticeable in glows and particles!!
BEFORE:

this tiny fix simply removes that alpha multiplication, essentially fixing this issue
AFTER:

texture2D has also been changed to flixel_texture2D, to allow Flixel color and alpha transformations to be applied (pictured below). this doesn't affect the appearance of sprites without these transformations applied

[inky03]

OK, really hope this is the last change i have to do...
color and alpha transform is now applied AFTER applying the hsbc effect. This should fix some previous issues with alpha transform and should make it consistent with flash / animate behavior. it also generally makes more sense for it to be applied like this, compared to how it previously did (pictured below)

BEFORE: (both images have the right hand character colored to RED ff0000)

AFTER:

i'll be happy to answer any further questions!!