HeliBoard 1.3

Changes since HeliBoard 1.3-beta1:

• update Serbian Cyrillic layout by @markokocic (#704, #705)
• update Estonia layout by @tenextractor (#693)
• fix duplicate entries in clipboard history by @codokie (#616, #680)
• only add text entries to clipboard history by @codokie (#711)
• better images in metadata by @RHJihan (#713)
• properly set color of icons in toolbar selection dialog by @codokie (#715, #716)
• other fixes (#684, #723 and more)