update TSMM
rewrite seek-index.

use decided frame's PTS and
scan for seek-frame explicitly.
deprecate FPS override:

xjadeo decoder uses PTS.

NB. This mechanism may return in order to
allow to override Timecode source
audio-frame-per-video-frame or TC fps.
add no-index option
change timecode-sources from long to int64
fix typo in windows font-path/reg-key
internal API to query video buffer size

(prepare for threaded Win, OSX GUI)
enable letterbox by default
change bundled font for OSX & Win to ArdourMono

ArdourMono is a renamed version of
https://www.google.com/webfonts/specimen/Droid+Sans+Mono
distributed under Apache License, version 2.0.
Since the name Droid(R) is registered by Google Inc it was
renamed to ArdourMono - otherwise the .tff is unchanged (build 112)
update expose strategy and OSD + splash handling.
threaded windows GUI (no more blocking resize, context-menu)
prepare 'p' osd position permute
windows list keyboard shortcuts in menu
add 'p' OSD position to existing menus
fix some compiler warnings
prepare release, update scripts and packaging
finalize changelog 0.8.0-rc2