[rename] XWMM to WIMM part 2

* Takes care of browser tab names now show WiMM
* Change copyright headers to conform

According to trademark cannot use XBMC Web Media Manager or Kodi Web
Media Manager.

http://kodi.wiki/view/Official:Trademark_Policy_index
more specifically
http://kodi.wiki/view/Official:Trademark_Policy#Related_Software

In any case the project is now renamed.