[CIUv3] Custom Installer Ultimate v3

[Cesar82]

After a long time, here is the CIU 3.0.0.1 beta 1.
There are many other changes that I want to add, but I do not have much time at the moment.

One new feature is the possibility to change a little bit about the interface window, using independent images Installer and Autorun.

Also added to the MaintenancePage, InfoPage (Info Before), and add a key to Uninstall Folder.

HOTFIX 1:
- Fixed About image in FinishPage (Did not load the image).
- Fixed About CloseButton loading Button.png if CloseAB.png does not exist (Thanks mausschieber).
- Fixed for compatibility with Inno Setup 6 (Needs testing, several errors appeared that did not happen using InnoSetup 5.59-5.61).

HOTFIX 1:
- Fixed NextButton showing in SmallInstaller.

PS:
- If anyone has time please test using Inno Setup 6.
- When I have ready version 3.0.0.1 (Final), I will create an installer for Inno Setup 6 similar to 5.61 that I did the repack.