Building on linux gives error about not providing Findtinyxml2.cmake

pretty straight forward problem, the required tinyxml2 package can't be found. Creating ./cmake/modules/Findtinyxml2.cmake with the following fixes the problem:

```
find_path(TINYXML2_INCLUDE_DIR
NAMES tinyxml2.h
DOC "The Tinyxml2 include directory"
)

find_library(TINYXML2_LIBRARY
NAMES tinyxml2
DOC "The tinyxml2 library"
)

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(tinyxml2
REQUIRED_VARS TINYXML2_LIBRARY TINYXML2_INCLUDE_DIR
)

if (TINYXML2_FOUND AND NOT TARGET tinyxml2::tinyxml2)
add_library(tinyxml2::tinyxml2 STATIC IMPORTED)
set_target_properties(
tinyxml2::tinyxml2
PROPERTIES
INTERFACE_INCLUDE_DIRECTORIES "${TINYXML2_INCLUDE_DIR}"
IMPORTED_LOCATION "${TINYXML2_LIBRARY}")
if (MSVC OR MINGW)
set_target_properties(
tinyxml2::tinyxml2
PROPERTIES
IMPORTED_IMPLIB "${TINYXML2_LIBRARY}"
)
endif()
endif()
`
```

Start by inspecting ./cmake/modules and reproducing the Linux build failure involving the missing Findtinyxml2.cmake file. Add the requested package-finder module there and confirm that the Linux build can locate the tinyxml2 headers and library without the reported error.

Written by the indexing model from the issue text.