Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# LibreOffice Template Library
+
+Very basic template functionality, a bit like boost or STL, but specific to LibreOffice.
+
+o3tl stands for "OOo [o3, get it?] template library", in which OOo stands for OpenOffice.org,
+predecessor of LibreOffice.
+
+From <https://blog.thebehrens.net/2006/01/15/update-cow_wrapper-is-available-now/>
+The scope for o3tl is admittedly kind of ambitious, as it should contain "...very basic (template)
+functionality, comparable to what's provided by boost or stl, but specific to OOo (what comes to mind
+are e.g. STL adapters for our own data types and UNO, and stuff that could in principle be upstreamed
+to boost, but isn't as of now)."
+
+## Class Overview
+
+- `[git:include/o3tl/cow_wrapper.hxx]`
+
+    A copy-on-write wrapper.
+
+- `[git:include/o3tl/lazy_update.hxx]`
+
+    This template collects data in input type, and updates the output type with the given update functor,
+    but only if the output is requested. Useful if updating is expensive, or input changes frequently, but
+    output is only comparatively seldom used.
+
+- `[git:include/o3tl/vector_pool.hxx]`
+
+    Simple vector-based memory pool allocator.
+
+- `[git:include/o3tl/functional.hxx]`
+
+    Some more templates, leftovers in spirit of STLport's old functional
+    header that are not part of the C++ standard (STLport has been
+    replaced by direct use of the C++ STL in LibreOffice).