[GSERIES] Custom Installer Ultimate V2g

[Gupta]

170728:

• redone all the tweaks from the previous release.
• Added ultraarc
• added multiple splash(Autorun\ASplash#.png, Setup\Splash#.png,Setup\Splash#_*.png(# - (1 to ?), * - Short name for language))
• multiple backgrounds for setup(already done by bamse, its a bit confusing for me thus write my own code)
• Fixed external compression, was broken in previous release

NOTE: Volume seeker and other music related tweaks from the previous release doesn't work in here, as i messed up external compression while adding them, will be reimplemented as soon as possible