Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

 templates/oscar#	gelöscht:       searx/static/themes/oscar/fonts/glyphicons-halflings-regular.ttf

Rename result field data_src to iframe_src

Suggested-by: @dalf https://github.com/searxng/searxng/pull/882#issuecomment-1037997402
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Suggested-by: @dalf https://github.com/searxng/searxng/pull/882#discussion_r805180787
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Embedded HTML breaks SearXNG architecture.  To modularize, HTML is generated in
the templates (oscar & simple) and result parameter 'embedded' is replaced by
'data_src' (and 'audio_src'), an URL for embedded content (<iframe>).

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Suggested-by: @dalf https://github.com/searxng/searxng/pull/295#discussion_r703337237
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Add default-image-style in::

    searx/static/themes/oscar/src/less/result_templates.less

Replaced style= in files::

    ./oscar/result_templates/default.html:19:        <img src="{{ image_proxify(result.img_src or result.thumbnail) }}" title="{{ result.title|striptags }}" style="width: auto; max-height: 60px; min-height: 60px;" class="col-xs-2 col-sm-4 col-md-4 result-content">
    ./oscar/result_templates/files.html:24:<img src="{{ image_proxify(result.img_src) }}" alt="{{ result.title|striptags }}" title="{{ result.title|striptags }}" style="width: auto; max-height: 60px; min-height: 60px;" class="col-xs-2 col-sm-4 col-md-4 result-content">

Reported-by: https://github.com/searxng/searxng/issues/57
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Some engine do have set result.img_src, other return a result.thumbnail.  If
result.img_src is unset and a result.thumbnail is given, show it to the UI.

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

* reduce by 15% the uncompressed output (on average)
* dos2unix searx/templates/oscar/result_templates/files.html