Image - add a new control styles and information for to help documentation

[EpicNet]

I am using "mIRC v7.67" + "DCX dll v3.1-git469" in system "Windows 8.1 x64".

My proposals for what needs to be corrected and added in "Image", to make it maximally functional and beautiful:

1. Add new style hcenter to align the image horizontally inside the control, when using the flag +k (for aspect ratio).
2. Add new style vcenter to align the image vertically inside the control, when using the flag +k (for aspect ratio).
3. Add information about the flag +k for the command "/xdid -i dcx 4 +k [file]" to the help documentation.
4. Add information about the flag +A for the command "/xdid -i dcx 4 +A [file]" to the help documentation.

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On the left is how it looks now, and on the right is how it could be after the update:

Here is a test piece of script to reproduce this the problem. To run the script click on "F5" or enter the command "/image_test":

alias F5 { image_test }
alias image_test {
  if ($dialog(image_test)) .dialog -x image_test | else { .dialog -m image_test image_test }
}
dialog image_test {
  title "Image test"
  icon $mircexe,0
  option pixels
  size -1 -1 450 300
}
on *:DIALOG:image_test:init:0:{
  .dcx Mark $dname image_test_work
  .xdialog -b $dname +ty
  .xdialog -g $dname +b $rgb(20,20,27)
  .xdialog -c $dname 1 image 30 25 390 250 notheme 
  .xdid -x $dname 1 +b
  .xdid -S $dname 1 1
  .xdid -C $dname 1 +b $rgb(40,40,47)
  var %image_path image\gif\file2.gif
  if ($exists(%image_path)) .xdid -i $dname 1 +abhkA %image_path
}
alias image_test_work {}

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Thanks for the fantastic improvements to your project. Don't stop there. We are waiting new updates! ⭐⭐⭐⭐⭐

[OokEek]

good idea, added it.