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Added support of formats fb3 and docx.
Fixed incorrect text rendering when some characters are substituted from fallback font.
Text formatting performance improvements.
Improved support of file managers "Files" (com.android.externalstorage.documents) and "Files" (com.google.android.apps.nbu.files).
Fixed dimming of on-screen system buttons with option "Dim keys highlight" on Android 4.4+ w/o fullscreen mode.
Information about used tango icon library is added to About.