PluginManager.Search Optimization

Identified a few opportunities to optimize PluginManager.Search relating to avoiding reading more information than necessary. Maybe half of these performance improvements only affects development builds.

In the MR, a tap.exe profile --search option was added and the following measurements could be done:

Before	After
1261ms	861ms
1250ms	914ms
1249ms	866ms

This affects the performance of raw startup time measured like this: time bin/Release/tap.exe --help:

Before	After
0m0.523s	0m0.448s
0m0.512s	0m0.447s
0m0.511s	0m0.463s
--------	--------
0.515s	0.452s