Reflection types, methods, fields and properties should be looked up in static constructors

[DorCoMaNdO]

Issues such as #121 are caused by reflection lookups failing, but since these lookups are only (re)performed when the execution of a feature requires them, it makes things harder to debug, especially since there's no error checking/logging for these lookups, it is also slower to use reflection over and over.

Performing all lookups in a static constructor that does error checking (ex: type != null before attempting to lookup fields, printing an error with the lookup target when null) will help address Unity/dependency incompatibilities faster by printing the error on load rather than on feature use, eliminating the need to test every reflection-dependent feature individually and will also speed up execution, which may have considerable improvement for some GUI-based events.