Remove instant library search as it can cause freezes

[davetgc]

Many users have 1000's of models and the current search system often caused freezes and crashes at the typing of a single letter. This issue is very common is the library contains a lot of objects that haven't used the importer (Noting that many users will be dragging old FPSC and GameGuru Classic models into the library.).

If the search required the user to press enter to initiate the search, this would prevent the system attempting to search 1000's of objects and allow for more precise, faster and more stable searches.

A common crash below:

[ZakJudges]

@davetgc I have not been able to reproduce this issue, but it is worth noting that not all Classic assets are compatible with Max. Importing via the model importer ensures that the models will be Max compatible. You can also run "Guru-Converter.exe" from the Max core install location, and also copy it to your writable folder to run there. That may also prevent the crash: #4185