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

17.8-123, 29 Oct 2017: Based off OSMC commit (c23905d) and newclock5 (974c3395)

Re-add pvr.filmon, pvr.pctv, and pvr.stalker

XBMC:
[PVR] Fix epg and pvr database reset (was completely broken). (PR:12967, 1 commit, 1 file changed)
FIX: [voicerecog] add alternative keys (PR:12859, 1 commit, 2 files changed)
[GUI] fix content dialog when changing content type back to “None” (PR:12965, 1 commit, 1 file changed)

pvr.filmon:
[Testing Required] update to PVR addon API 5.7.0 (PR:76, 3 commits, 6 files changed)
update to GetChannelStreamProperties() (PR:77, 1 commit, 1 file changed)

pvr.pctv:
[Testing Required] update to PVR addon API 5.7.0 (PR:52, 1 commit, 7 files changed)

pvr.stalker:
[Testing Required] update to PVR addon API 5.7.0 (PR:100, 1 commit, 6 files changed)