[TYPO3-v4] Polish for 4.6

[Steffen Kamper]

Hi,

as 4.6 is a good chance to polish things here are some first suggestions:

1) remove typo3/gfx
These images are not used any longer. Also they are duplicated in 
sysext/t3skin/icons/gfx. Those which are missing there could be copied 
to this place.
A rewrite rule in htaccess could be the backwards compatible way if 
anyone refers direct to the old resources

2) remove statictemplates
We already made this a sysext. The templates are old school and only 
usable for demo purpose. Now with introduction package, a site can be 
set up in a minute, so this extension is not helpful. Move it to TER.

3) remove jsMinify, json wrapper etc
jsMinify is very in-performant and should not be used. There are other 
possibilities to compress scripts, we should use more modern tools. JSON 
wrapper is not needed anymore as it's build in php

just a start ...

vg Steffen