[Draw][Place] Fix Manual Moves

[haydar-c]

This PR fixes a segmentation fault when using manual moves in placement and enables using manual moves in the inner annealing loop as well. Previously, manual moves worked only before the inner annealing loop and would segfault, since reward calculation was still invoked even though no move generator was used.

Changes

• Guard reward calculation when manual_move_enabled is true
• Add explicit checking of the manual move option inside the inner annealing loop.

Related Issue

#3275

[AlexandreSinger]

LGTM! Thanks!

[vaughnbetz]

Just to be paranoid, can you run one design before and after this change (a reasonable size one) and compare CPU time in placement to make sure it doesn't slow down? I think the overhead of the extra check should be minimal but it is good to be paranoid.

[vaughnbetz]

The pause button and the debug buttons basically worked.
One issue with the debug button: breaking at router iteration 3 didn't actually stop at iteration 3 most of the time, although it did say it stopped sometimes. Stopping in placement seemed OK.
==> Debug the router iteration / debug options.

==> Other issue: update the graphics documentation and debug documentation on the vtr website to explain these buttons.
==> A few pictures at the start of the graphics documentation are also out of date (old menu bar) --> would be good to update them. Later pictures look OK.

[haydar-c]

Adding the largest 2 VTR Chain benchmark place times normalized to without change. They seem negligible.

Circuit	Normalized Placement Time (With Change / Without Change)
LU32PEEng.v	0.9972
mcml.v	1.0086

Planning to raise another PR for the debug/breakpoint options and graphics documentation (including updating the start of the graphics documentation).