add search method

    search <scope> <text> <count> ['{"username":username,"mode":"exact"|"all"|"any","case":"sensitive"|"insensitive","agemin":agemin,"agemax":agemin}']

    search text in available data
    <scope> is data area: messages, directmsgs, profiles, users, hashtags
    <text> is a phrase to search
    up to <count> entries are returned
    <username> in messages scope is optional and allows to search in username's messages only
    <username> in directmsgs scope is required and sets whose conversation to search
    "mode" and "case" are search mode options
    "agemin" and "agemax" (days) are message date filter
    "mode", "case", "agemin", and "agemax" are optional