Performance improvements

[abrichr]

Addresses:

• windows capture broken #579
• [Bug]: Mouse flickers during capture on Windows devices #607

These changes appear to reduce processing time for screenshots by a factor of ~2, and reduces memory consumption by about 25% for a ~30s recording.

It also removes the top line of the memory usage reported by tracemalloc.

Before:

                      types |   # objects |   total size
=========================== | =========== | ============
                  bytearray |          44 |    919.72 MB
                _io.BytesIO |           3 |     23.52 MB
                      tuple |       32202 |      2.15 MB
                       list |       20687 |      2.03 MB                                                                                        str |       23350 |      1.73 MB                                                                                       dict |        1053 |    438.16 KB                                                                                        int |        6355 |    174.23 KB                                                                  tracemalloc.StatisticDiff |        2141 |    150.54 KB
      tracemalloc.Traceback |        2141 |    100.36 KB
          collections.deque |         145 |     88.36 KB
                       type |          54 |     68.69 KB
                        set |         189 |     43.62 KB
                       code |         182 |     39.64 KB
      weakref.ReferenceType |         362 |     25.45 KB
                  frozenset |          89 |     24.77 KB

After:

2024-04-22 12:08:44.688 | INFO     | __main__:log_memory_usage:78 - trace_str=
                                     types |   # objects |   total size
========================================== | =========== | ============
                               _io.BytesIO |           3 |     17.64 MB
                                     tuple |       34125 |      2.28 MB
                                      list |       15209 |      1.58 MB
                                       str |       18449 |      1.39 MB
                                      dict |        1091 |    458.73 KB
                 tracemalloc.StatisticDiff |        2258 |    158.77 KB
                                       int |        5260 |    144.34 KB
                     tracemalloc.Traceback |        2258 |    105.84 KB
                         collections.deque |         142 |     86.53 KB
                                      type |          69 |     80.70 KB
                                      code |         294 |     57.28 KB
                                       set |         194 |     47.17 KB
                     weakref.ReferenceType |         381 |     26.79 KB
                                 frozenset |          90 |     24.98 KB
  sqlalchemy.orm.attributes.AttributeEvent |         210 |     11.48 KB