Add new STRING type to FrontendInfo

Now you can get the frontendinfo in once string including color codes
instead of having long configs in skins
Sorry I forgot to declare res_mgr in FrontendInfo
Some optimalizations for fontdisplay VuDuo/ET10000
FrontendInfo: Do not show empty slots in STRING type
Enigma2 ac3+ cache add patch

Signed-off-by: pieterg <pieterg@users.sourceforge.net>
Merge branch 'master' of git://git.code.sf.net/p/openpli/enigma2