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This allows to give unescaped ampersands and equal signs in the json
configuration or parsed anchors of clip urls.

They must be escaped because they are written as flashvars into the
generated object.

Whereas api methods, like play(url), needed unescaped urls.

This change tries to be very defensive and only addresses clip urls
to avoid the issues encountered in 3.2.8 with point blank escaping the
entire configuration. Note that the substitution also touches the query
part of an url only as & and = are only allowed there.

Use case: amazon cloudfront signed urls.

See also: http://flash.flowplayer.org/forum/8/103438/

TODO: look for other occurences where this can be done in a safe way,
like for the queryString paramter of the pseudostreaming plugin.

Issue #26: make isFullscreen return something meaningful

- #615 dispatch begin if in paused mode too early.

Issue #24: ipad: poster image independent of validExtensions logic

Issue #22: ipad: reinstate validExtensions variable

- poster image retrieval should also work when validExtensions is
  unset by user: move it out and before validExtensions check
- tighten and simplify the poster detection logic for playlist-based
  splash images only: image must be first item in a playlist of
  length > 1
- clean up indentation for readability

http://code.google.com/p/flowplayer-plugins/source/detail?r=1968
accidentally set validExtensions always to null, thus disabling
all file suffix checking and also preventing poster creation by
playlist based splash image setups.

- #629 if start has been dispatched already prevent dispatching many begin events.
- Fixes for #15

- #15 fixes for #627, handle the display init on startup.

- #15 add cache busting to the file being checked for availability to play back correctly once resolving has completed.

- #12 if css method used as a getter just return the current style confi...

- #7 add start event filter for clips with bitrateitems as well as bitra...

- #630 move seek event dispatching to buffer full or else the time hasn'...

- #7 check for stage availability on menu before positioning the dock or position once stage is available when resetting menu items.

- #630 when the event is null we're in silent seek during controlbar dragging, only seek when not silent.

Danielr core

- #614 when the clip ends if the next clip in the provider has a different provider close the provider stream.
- #627 only detach / attach the display on start events which causes issues in buffering events after a seek in stagevideo.
- #627 re-enable stagevideo state change listeners if stagevideo is available or detach the fullscreen events on first call.