[lib][external][studxml] add libstudxml

Author: amin1377

libs/EXTERNAL/xlnt/third-party/libstudxml/INSTALL

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+The easiest way to build this package is with the bpkg package manager:
+
+$ bpkg build libstudxml
+
+But if you don't want to use the package manager, then you can also build it
+manually using the standard build2 build system.

libs/EXTERNAL/xlnt/third-party/libstudxml/LICENSE

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+MIT License
+
+Copyright (c) 2013-2025 Code Synthesis Tools CC.
+Copyright (c) the Expat authors for the libstudxml/details/expat/* files.
+Copyright (c) the Genx authors for the libstudxml/details/genx/* files.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

libs/EXTERNAL/xlnt/third-party/libstudxml/NEWS

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+Version 1.0.0
+
+  * Initial release.

libs/EXTERNAL/xlnt/third-party/libstudxml/README

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+libstudxml is a streaming XML pull parser and streaming XML serializer
+implementation for modern, standard C++. It has an API that we believe
+should have already been in Boost or even in the C++ standard library.
+For more information see:
+
+http://www.codesynthesis.com/projects/libstudxml/
+
+See the NEWS file for the user-visible changes from the previous release.
+
+See the LICENSE file for distribution conditions.
+
+See the INSTALL file for prerequisites and installation instructions.
+
+See the doc/ directory for the API documentation.
+
+See the examples/ directory for examples. See examples/README for an
+overview of the provided examples as well as the README file in each
+example directory for more details on any particular example.
+
+See the tests/ directory for the test suite.
+
+Send questions, bug reports, or any other feedback to the
+studxml-users@codesynthesis.com mailing list.

libs/EXTERNAL/xlnt/third-party/libstudxml/README-GIT

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+The checked out libstudxml/version.hxx will be overwritten during the build
+process but these changes should be ignored. To do this automatically, run:
+
+git update-index --assume-unchanged libstudxml/version.hxx

libs/EXTERNAL/xlnt/third-party/libstudxml/buildfile

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+# file      : buildfile
+# license   : MIT; see accompanying LICENSE file
+
+./: {*/ -build/} doc{INSTALL NEWS README} legal{LICENSE} manifest
+
+# Don't install examples, tests or the INSTALL file.
+#
+examples/:       install = false
+tests/:          install = false
+doc{INSTALL}@./: install = false

libs/EXTERNAL/xlnt/third-party/libstudxml/doc/buildfile

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+# file      : doc/buildfile
+# license   : MIT; see accompanying LICENSE file
+
+define css: file
+
+css{*}:
+{
+  extension = css
+  install = doc/
+}
+
+./: doc{intro.xhtml} css{default}