Refactory messy`store_item` method

[mlitwiniuk]

This store_item method looks too messy to me. Maybe you could 1. remove commented transaction block 2. extract this lengthy conditional to separate method? However this would require handling startup_process variable differently. To be honest if startup_process is true most of this method is skipped entirely. Maybe startup_process can live in Lit.startup_process?

Originally posted by @pnikrat in #130 (comment)