Add feature: Print breakpoint table

[yihuajack]

Take example5.evcd, breakpoints=[9,11,17] as example, the table is:

time    9       11      17
scope   testbench
scope   pe8
req_I   128     16      4
req_O   zzzzzzzz        zzzzzzzz        zzzzzzzz
en_I    1       1       1
en_O    z       z       z
scope   pe4
req_I   8       4       2
req_O   zzzz    zzzz    zzzz
en_I    1       1       1
en_O    z       z       z

[yihuajack]

The column width of tables can be fine-adjusted, but to achieve it, sootty needs to recursively see all the wires twice, so performance is lost.

[Ben1152000]

Have you tested if this works when the waveform is being displayed? The svg is written to stdout and piped to the display program, so if the breakpoints are also printed to stdout that could possibly break the image.

[yihuajack]

Have you tested if this works when the waveform is being displayed? The svg is written to stdout and piped to the display program, so if the breakpoints are also printed to stdout that could possibly break the image.

Yes, I've tested that this works with or without -o, but I'm not quite familiar with subprocess. What if subprocess.run is used instead of subprocess.Popen()?