Metadata: Add METADATA/TMDB debug behind a debug option in settings:dev

Also add more verbose logging when option is turned on

refs #2354
plguins: Add a dev-settings that forces all plugins to be loaded as ecmascript
Update Danish translation
Update pl_PL.lang

Minor fixes. Plus I've noticed there are no translatable strings for
Horizontal Pan
Vertical Pan
Under Video settings, could You fix this.
sqlite: Fix broken log supression filter
Improve log/trace formating a bit
metadata: Don't use a common .NFO file for multiple videos in same folder

Also reduce number of calls to the metadata providers by coalescing metadata
lookups better

Fixes #2356
posix.c: Remove some unused crap
net_posix.c: Fix strict aliasing issues
Some fixed in common code for NaCl
ecmascript/api-v1: Map plugin.addHTTPAuth to Showtime.httpInspectorCreate

Fixes #2358
Merge pull request #174 from copernic-us/patch-2

Update pl_PL.lang
ecmascript: Implicit toString() in hashUpdate

Fixes #2365
glw: Fix a memory leak
glw/video: Clear glw_video_surface_t after use
glw/vdpau: Fix problem when we switch from non-vdpau to vdpau video rendering
usage: Plug a tiny mem leak (on exit)
ecmascript: Fix problems with incorrect reference counting
asyncio_posix.c: Fix race on asyncio_thread_id global variable
ecmascript/settings/multiopt: Make sure option id is a string

refs #2344