Drop o3tl::optional wrapper

...now that macOS builds are guaranteed to have std::optional since
358146bbbd1b9775c12770fb5e497b6ec5adfc51 "Bump macOS build baseline to
Xcode 11.3 and macOS 10.14.4".

The change is done mostly mechanically with

> for i in $(git grep -Fl optional); do
>  sed -i -e 's:<o3tl/optional\.hxx>\|\"o3tl/optional\.hxx\":<optional>:' \
>   -e 's/\<o3tl::optional\>/std::optional/g' \
>   -e 's/\<o3tl::make_optional\>/std::make_optional/g' "$i"
> done
> for i in $(git grep -Flw o3tl::nullopt); do
>  sed -i -e 's/\<o3tl::nullopt\>/std::nullopt/g' "$i"
> done

(though that causes some of the resulting

  #include <optional>

to appear at different places relative to other includes than if they had been
added manually), plus a few manual modifications:

* adapt bin/find-unneeded-includes
* adapt desktop/IwyuFilter_desktop.yaml
* remove include/o3tl/optional.hxx
* quote resulting "<"/">" as "&lt;"/"&gt;" in officecfg/registry/cppheader.xsl
* and then solenv/clang-format/reformat-formatted-files

Change-Id: I68833d9f7945e57aa2bc703349cbc5a56b342273
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/89165
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

1 files changed, 5 insertions, 5 deletions

diff --git a/svgio/inc/svgnode.hxx b/svgio/inc/svgnode.hxx
index ecba14022f57..dd9f53cc9d2f 100644
--- a/svgio/inc/svgnode.hxx
+++ b/svgio/inc/svgnode.hxx
@@ -26,7 +26,7 @@
 #include <drawinglayer/primitive2d/baseprimitive2d.hxx>
 #include <memory>
 #include <vector>
-#include <o3tl/optional.hxx>
+#include <optional>
 
 // predefines
 namespace svgio
@@ -94,10 +94,10 @@ namespace svgio
             std::vector< std::unique_ptr<SvgNode> >  maChildren;
 
             /// Id svan value
-            o3tl::optional<OUString>   mpId;
+            std::optional<OUString>   mpId;
 
             /// Class svan value
-            o3tl::optional<OUString>   mpClass;
+            std::optional<OUString>   mpClass;
 
             /// XmlSpace value
             XmlSpace                    maXmlSpace;
@@ -167,11 +167,11 @@ namespace svgio
             double getCurrentXHeight() const;
 
             /// Id access
-            o3tl::optional<OUString> const & getId() const { return mpId; }
+            std::optional<OUString> const & getId() const { return mpId; }
             void setId(OUString const &);
 
             /// Class access
-            o3tl::optional<OUString> const & getClass() const { return mpClass; }
+            std::optional<OUString> const & getClass() const { return mpClass; }
             void setClass(OUString const &);
 
             /// XmlSpace access