Fix compiler warning (and minor cleanup).
Library: Added <minsize> element used for buffer overrun checking
Add some more functions to posix.cfg which allow to enable TestBufferOverrun::buffer_overrun_1_posix_functions
Fix some compiler warnings on MSVC
astyle formatting

[ci skip]
Fixed #5257 (Check memcpy size for string literals)
Fix MSVC compiler warnings
Avoid crash reported in #5943 (using the example from duplicate ticket #5971)
Replace a few size_t/unsigned int by std::size_t
astyle formatting

[ci skip]
ValueFlow: Cleanup code by using SymbolDatabase provided scope info
Fixed #5968 (False positive: 'Possible null pointer dereference' when checking null in negated conjuction)