[TESTING] Kodi 18 (Leia) builds for Raspberry Pi

17.8-077, 2 June 2017: Based off OSMC commit (628164163) and newclock5 (e7af60b)

XBMC:
[dependencies][windows] bump libmicrohttpd to 0.9.55 (PR:12205, 1 commit, 2 files changed)
[addons] add first step of gui on addon interface (PR:12202, 1 commit, 39 files changed)

Includes latest addons: inputstream.adaptive (f1f5539d), inputstream.rtmp (d93d32d4), peripheral.joystick (d6cbf198), pvr.argustv (b281e04f), pvr.demo (ffee02b8), pvr.dvblink (6d42eae1), pvr.dvbviewer (3f05af60), pvr.filmon (300c595e), pvr.hdhomerun (9073b99b), pvr.hts (7f998e0f), pvr.iptvsimple (dbf6011e), pvr.mediaportal.tvserver (07d73f3a), pvr.mythtv (f2da22ca), pvr.nextpvr (239dbef3), pvr.njoy (4785afd2), pvr.octonet (9bbd7cf3, +9), pvr.pctv (f61e2541), pvr.stalker (151e3d3f), pvr.vbox (df9efea4), pvr.vdr.vnsi (40dc17d0), pvr.vuplus (83a729ea), pvr.wmc (93cebfc7), vfs.rar (4ce78b0f)