Natvis intrinsic support

[lugerard]

This PR adds two improvements to the NatVis engine for GDB/LLDB.

Strip dll!-qualified module prefixes

NatVis files targeting Windows often qualify type names with a module prefix (e.g. Qt6Cored.dll!) to disambiguate types. These prefixes are meaningless to GDB and LLDB and cause expression evaluation to fail on Linux/macOS. ReplaceNamesInExpression now strips them before any expression is sent to the debugger.

Intrinsic support

elements define named inline expressions within a block that can be called by name (with optional parameters) in any DisplayString or Expand expression in the same block. MIEngine previously ignored them silently, causing visualizers that rely on intrinsics to fall back to raw view. This change collects intrinsics from the block and resolves calls before expression evaluation. The schema (natvis.xsd) and generated types (NatvisXsdTypes.cs) are updated accordingly.

Added tests.

[lugerard]

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[lugerard]

@Waan @greggm would appreciate a review when you have a moment.