Building Editor: Add right-click menu option to delete level in Level Indicator

[osrf-migration]

Original report (archived issue) by Steffi Paepcke (Bitbucket: spaepcke).

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Users can delete a level by right-clicking outside of the building, but it would be good to also let users right-click on the level they'd like to delete, in the Level Indicator.

[osrf-migration]

Original comment by Steffi Paepcke (Bitbucket: spaepcke).

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• removed "557058:10b01d41-a2e9-4a41-a907-e6e2f03b6cd5" assignee_account_id
• changed assignee from "iche033 (Bitbucket: iche033, GitHub: iche033)" to "None (Bitbucket: None)"

[osrf-migration]

Original comment by Nate Koenig (Bitbucket: Nathan Koenig).

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• changed state from "new" to "on hold"

Until 2.0

[osrf-migration]

Original comment by Ian Chen (Bitbucket: Ian Chen, GitHub: iche033).

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• changed state from "on hold" to "open"

[osrf-migration]

Original comment by Steffi Paepcke (Bitbucket: spaepcke).

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• changed state from "open" to "resolved"

Not necessary given addition of "-" button in GUI

[osrf-migration]

Original comment by Louise Poubel (Bitbucket: chapulina, GitHub: chapulina).

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- button: Pull request #1214

[osrf-migration]

Original comment by Nate Koenig (Bitbucket: Nathan Koenig).

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• set version to "all"

[osrf-migration]

Original comment by Nate Koenig (Bitbucket: Nathan Koenig).

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• changed state from "resolved" to "closed"