Widgets stop working on comshare or `/team`

[sprunk]

Some widgets assume that you can't change teams (broken by comshare and /team) and that you can't stop being a spectator (broken by /team). A corollary is that widgets can assume there is no-one else on your team; widgets assuming this can interfere with other players (for example GBC: #1836).

The task is to check all widgets on whether they need fixing, and fix them.

Some reported widgets known to have broken in the past:

• transport AI
• auto groups
• "unit under attack" text (changing live team is fine but going from spec to live isn't)
• some of (auto patrol nanos, auto repair, and smart nanos), see #5188