List former partners on homepage

[markknol]

Under the title "With support from". To thank former partners as sponsor to Haxe. Also because there are great names in there, which we are still proud of.

@Simn which partners needs to be listed here?

[Simn]

These are the current partners:

• InnoGames
• Docler
• TiVo
• Proletariat
• Playtika
• Flowplay
• Spielepalast
• Veith System

So everyone else who's currently on the list can go to the former section, alongside prezi. I might be forgetting someone.