Project rename part 2

Decided to do this as a PR for two reasons.

1) All developers or people involved with XWMM/WiMM can see what changes are being made
2) To also show @slash2009 how the project should be renamed and also the project description

For 2) see https://github.com/uNiversaI/WiMM please note its not XWMM but WiMM and most importantly
The project description must be also changed to ***Web inteface Media Manager (WiMM) for Kodi***

There are loads of XBMC named files/functions and XWMM hard-coded stuffs, Im not doing any of those because really dont want to break anything.

@fyfe @nwtn @slash2009 @criticalfiction 

Will mark this as approved and if no one has anything to say will merge in a few days.

All other changes in 2) require @slash2009 since we have no access to do those.