Ignore whitespaces in filter text search

[Adda0]

This PR modifies the filter search function to ignore any spaces in the searched text, as well as the user-given search query.

I noticed that many mods have inconsistent names within a single mod (mod group), especially with different placement of spaces between the folder name (group name) and mod names within the folder. I constantly battle with searching in Stardrop by placing spaces in random places until the search finds the mod I am looking for.

This PR fixes this problem for me entirely. Now, I can search for whatever form of the name I remember and be sure to find the mod I am looking for. And then optionally click on one mod to show the whole mod group (see #150), if necessary.

Example:

• The user searches for "copper still" since he remembers that is the name of the mod using the filter "Mod Group".
• The individual mods are named "[CP] Copper Still", "[JA] Copper Still", etc. indeed, but the folder name is "CopperStill".
• The search returns empty list, but with this PR included, the search correctly finds the mod group.

Tested on Linux, not tested on MacOS or Windows.

[Floogen]

Merged! Thank you for the pull request.