[Feature]: Search by ilvl

[Porkepix]

Describe the feature

Items should be searchable by ilvl, this is something that existed and worked with AdiBags

Describe the implementation

Search by ilvl by just writing an ilvl in the search field, as it was working in AdiBags. This is especially usefull to empty bags of old raids gear that lost their "new item" tag.

One could imagine more complex search expressions like ilvl: <200 ; ilvl ≥ 300 etc. but that would come with the implementation of complex search expressions (which could include search by category, piece of gear etc. etc.)

Get back at a simple search by writing the ilvl would already be a good first step.

[Cidan]

Duplicate of #272