* fixed Bin in FeedDetails showing full episodes when empty
* on new install, first opens FindFeeds screen
* amended Search screen
	* search texts are persisted (capped around 20) and can be recalled
	* search options are by default hidden, tap "Setting" icon to show
* when starting a new episode, skipSilence is reset
* fixed deprecation of CountingInputStream
* amended the code checking ID3 header
* some code refactoring
