Fix invalid string construction from null TextOffset in ifc-dom loade…

…rs (#91)

* Initial plan

* Fix invalid string construction in ExprLoader operators

Co-authored-by: gdr-at-ms <11031650+gdr-at-ms@users.noreply.github.com>

* Comprehensive fix for unsafe TextOffset string construction

Co-authored-by: gdr-at-ms <11031650+gdr-at-ms@users.noreply.github.com>

* Refactor: Replace repeated null check patterns with reader_get helper method

Co-authored-by: gdr-at-ms <11031650+gdr-at-ms@users.noreply.github.com>

* Change reader_get return type to std::string for better interface design

Co-authored-by: gdr-at-ms <11031650+gdr-at-ms@users.noreply.github.com>

* Remove "safe" qualifier from reader_get comment

Co-authored-by: gdr-at-ms <11031650+gdr-at-ms@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: gdr-at-ms <11031650+gdr-at-ms@users.noreply.github.com>

Add bcrypt.h include (#79)

Add required include, discovered while compiling a portion of the IFC SDK in isolation

Move MSVC-specific warning suppression data to the MSVC traits (#69)

Move MSVC-specific warning suppression data to the MSVC traits / add data for suppression level

Document `ifc` driver facility (#60)

Update BUILDING.md (#54)

Initial contents.