Update empty method guards to new style with regex (see PR).
Used clang-format 18.1.8.
New actions to validate code formatting is added.
Update .clang-format with disabling of include sorting.
It is temporary changes, then include will be sorted.
Apply formatting for /src and /tools folder.
The files with .hxx,.cxx,.lxx,.h,.pxx,.hpp,*.cpp extensions.
All occurrences of Standard_EXPORT attached to inline methods in OCCT code are eliminated.
Some unused classes and C++ files producing no code are deleted.
Added test case that works in one of two modes:
1) create synthetic document (in old version of OCCT) containing all possible attributes.
2) open the document and compare all attributes with expected values.
Fixed reading of TDataStd_NamedData, TDataXtd_PatternStd, and PColStd_HArray2OfReal.
Point and curve representations are created even from NULL geometry handles.
The code is simplified by abandoning usage of templates from StdObjMgt_ContentTypes class for persistent data elements.
Fixed SetAsciiString Draw command failed when the target label contained NamedData attribute.
Possibility to read shapes and OCAF documents from old persistence format (Std and StdL schema) is restored.
Test cases used old persistent files on input are restored with suffix "_std"
Removing toolkit from OS package
Added basic support for possibility to read filed in old persistent format.
Toolkits TKStd, TKStdL, TKShape added to provide necessary tools (to be done).
Obsolete interfaces are removed from classes in PCDM and Storage.
