Flat Routing Visualization #3159
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Several changes were made for flat routing visualization.
Firstly, I modified the draw intra-logic block code so that the margins between blocks are absolute and not based on relative size. The intra-logic blocks are also now drawn to be not long and skinny, and instead must have a reasonable width-to-height ratio. Furthermore, the intra-logic blocks of maximum depth were previously not drawn. That has also been fixed.
To get the pin locations of intracluster RRNodeId, I made helper functions to convert RRNodeId into cluster_blk_id and pb_graph_pin. I also separated the code which draws edges and pins, primarily for readability and also to avoid repetition. The loops with clusternets were replaced with atomnets when flat routing is enabled. Lastly, for testing and debugging purposes, the ability to click on intracluster pins to highlight the net was added.