Work/fa.fix missing artag behavior

[ValentinVERGEZ]

Si l'ArTag était perdu pendant la phase d'approche ArTag, ça partait en cacahuète. C'était surtout dû à l'absence de reset de cmd_vel.

Maintenant on abort après une absence prolongé de l'ArTAg.

NB: A valider avec moi, j'ai peur d'avoir loupé un comportement, cas d'un ArTag vu mais pas le bon.

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This change is

[vcoelen]

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Reviewed 3 of 3 files at r1. Review status: all files reviewed at latest revision, all discussions resolved.

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[vcoelen]

Reviewed 1 of 1 files at r2. Review status: all files reviewed at latest revision, all discussions resolved.

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[vcoelen]

Reviewed 1 of 1 files at r3. Review status: all files reviewed at latest revision, all discussions resolved.

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[vcoelen]

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Reviewed 1 of 1 files at r4. Review status: all files reviewed at latest revision, all discussions resolved.

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