refactor(*Stack): Use local variables

[ChristianTackeGSI]

... instead of member variable fFSTrackIter.

Deprecate that member variable.

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Checklist:

• Followed the Contributing Guidelines

[coderabbitai]

Walkthrough

Walkthrough

The recent changes to the FairStack and FairGenericStack classes involve refactoring for improved code clarity and maintainability. Key modifications include the introduction of the FSTrackMapLookup method for track ID retrieval, simplification of existing methods, and the use of modern C++ practices such as range-based for-loops and auto type inference. Additionally, compiler directives have been added to suppress warnings for deprecated declarations, ensuring compatibility with older code.

Changes

File	Change Summary
.../mcstack/FairStack.cxx	Refactored GetCurrentTrackNumber and AddPoint methods to use FSTrackMapLookup, simplified track management logic, and replaced iterator with range-based for-loop in SelectTracks.
.../sim/FairGenericStack.cxx, .../sim/FairGenericStack.h	Added compiler directives to suppress deprecated warnings, modified FastSimMoveParticleTo to utilize FSTrackMapLookup, and updated FastSimUpdateTrackIndex to include const qualifier and use auto. A new method FSTrackMapLookup was also added.

Possibly related PRs

• refactor(Base): Call GetCurrentTrackNumber directly from FairGenericStack #1588: This PR modifies the FairGenericStack::FastSimMoveParticleTo method to replace the logic for retrieving the current track ID with a call to GetCurrentTrackID(), which is related to the changes in the main PR that refactor the logic for track management in the FairStack class, specifically through the use of FSTrackMapLookup.

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Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between 2ab409c and 6decd1e.

Files selected for processing (3)

• examples/common/mcstack/FairStack.cxx (6 hunks)
• fairroot/base/sim/FairGenericStack.cxx (4 hunks)
• fairroot/base/sim/FairGenericStack.h (2 hunks)

Files skipped from review as they are similar to previous changes (3)

• examples/common/mcstack/FairStack.cxx
• fairroot/base/sim/FairGenericStack.cxx
• fairroot/base/sim/FairGenericStack.h

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