Annotate ping and buildanchored commandmode

[lL1l1]

Description of the proposed changes

Annotate these less often used and weird command modes.

• ping mode:

  • does not get cancelled by right click like other modes
  • passes data from StartCommandMode to EndCommandMode on left/right click without any modifications

• buildanchored mode: restrictive, inaccurate, and unpolished version of build mode.

Testing done on the proposed changes

• check the engine for 'ping' string to be a command mode. If any other string is used in StartCommandMode the engine will give a warning (CUIActionHandler::GetLeftMouseButtonAction got invalid commandMode: %s), which can be used to find where all the strings are checked (func at 0x0081F7B0).
• log the IsCancel param and click around with various command modes.
• Test buildanchored mode with multiple/single ACUs building a factory and a T1 pd.

import('/lua/ui/game/commandmode.lua').StartCommandMode("buildanchored", { name='uab0101' })

Checklist

• Changes are annotated, including comments where useful
• Changes are documented in the changelog for the next game version