Tacmap lacks full multiz support

### Testmerges

10611

### Round ID

N/A

### Description of the bug

- Only current Z view is submitted to marines despite there being icons & drawings on other Zs
- Admin tacmap panel only displays the Z viewed when submitting the tacmap
- Tacmap viewers only display the viewed Z when the tacmap was submitted

For example drawing 1, 2, and 3 on each Z but looking at this Z when submitting it, then taking a marine to that Z they see this (correct):

That Z as a ghost (so live - correct):

But then we go up a Z. Marine sees this (incorrect):

Ghost sees this (correct):

Command tacmap sees this (correct):

### What's the difference with what should have happened?

- All Zs should be submitted
- Admin tacmap panel should show all Zs or a way to change Z
- Tacmap viewer should show all Zs or a way to change Z

### How do we reproduce this bug?

1. Boot game with a multi-z map e.g. White Antre Research Facility
2. Optionally change to distress signal
3. Draw on tacmap on different Zs
4. Submit (only currently viewed Z will be submitted)
5. View as marine on that Z vs other vs as a ghost

### Issue Bingo

- [x] Issue could be reproduced at least once
- [x] Issue happened in a recent (less than 7 days ago) round
- [x] Couldn't find an existing issue about this (https://github.com/cmss13-devs/cmss13/issues)

Reproduce the issue on the White Antre Research Facility map by drawing on multiple Z levels and submitting the tacmap. Trace the tacmap submission, admin panel, and viewer entry points to determine where the current Z is selected. Done means all Z levels are submitted and can be viewed by marines, admins, and ghosts, with the stated reproduction steps passing.

Written by the indexing model from the issue text.