* Fix cmake warning about newlines
* Find python3 in cmake, fix warning (gazebosim#328)

Signed-off-by: Steve Peters <scpeters@openrobotics.org>

Merge 6 -> 9

Adds a sentence to the behavior of //model/static to avoid confusion on what might happen if it is used within a model that is itself included in another model. Also adds some clarification to //model/@canonical_link.

Signed-off-by: FirefoxMetzger <sebastian@wallkoetter.net>
Signed-off-by: Addisu Z. Taddese <addisu@openrobotics.org>
Co-authored-by: Addisu Z. Taddese <addisu@openrobotics.org>

Signed-off-by: Jenn Nguyen <jenn@openrobotics.org>

Signed-off-by: Louise Poubel <louise@openrobotics.org>

Signed-off-by: Louise Poubel <louise@openrobotics.org>

This replaces most of the custom cmake code in
libsdformat with the functionality provided by
ignition-cmake2. The root CMakeLists.txt is much shorter
now and most of the cmake folder has been deleted.
This is made possible by the NO_IGNITION_PREFIX
and REPLACE_IGNITION_INCLUDE_PATH parameters
added to ign_configure_project in ign-cmake#190 and
ign-cmake#191. Closes gazebosim#181. Other details:

* Use FindIgnURDFDOM from ign-cmake#193
* Use HIDE_SYMBOLS_BY_DEFAULT from ign-cmake#196
* Set LEGACY_PROJECT_PREFIX from ign-cmake#199

Signed-off-by: Steve Peters <scpeters@openrobotics.org>

Signed-off-by: Steve Peters <scpeters@openrobotics.org>

The USE_INTERNAL_URDF logic for include and
windows compiler definitions needs to be repeated
for tests that add parser_urdf.cc via target_sources.
An interface library is used to deduplicate the cmake
logic.

Signed-off-by: Steve Peters <scpeters@openrobotics.org>

Signed-off-by: Steve Peters <scpeters@openrobotics.org>

Signed-off-by: Steve Peters <scpeters@openrobotics.org>

…to_11

Account for new behavior of nested models and :: syntax.

Signed-off-by: Steve Peters <scpeters@openrobotics.org>

Merge part of 10 to 11

Signed-off-by: Steve Peters <scpeters@openrobotics.org>

Merge sdf10 -> sdf11

Signed-off-by: Steve Peters <scpeters@openrobotics.org>

Merge sdf11 to sdf12

Signed-off-by: Louise Poubel <louise@openrobotics.org>

* Add line with unrecognized type

Signed-off-by: Steve Peters <scpeters@openrobotics.org>

* Fix for custom element with attribute 'type' (gazebosim#811)

* Reverted changes to parser for custom element with attribute 'type',
  added fix in ParamPrivate::ValueFromStringImpl instead

Signed-off-by: Aaron Chong <aaronchongth@gmail.com>

Co-authored-by: Steve Peters <scpeters@openrobotics.org>
Co-authored-by: Aaron Chong <aaronchongth@gmail.com>