[configure] don't use relative include paths in addon headers
this breaks xbmc dev packages where all headers are installed in standard include paths
[configure] install missing addon bindings
Merge pull request #2964 from wsnipex/configure

[configure] don't use relative include paths in addon headers
fixed, signed/unsigned compiler warning
fixed, compiler warnings
[cddb] fix broken hello command should be as "cddb hello username hostname
clientname version"
[lang] update of internal addon language files
[lang] update of core language files
[lang] update of skin.confluence language files