Sozi release 21.08.02

This release fixes a regression that was introduced in Sozi 21.08.01-1627813731.
Compared to the previous releases 21.02, this release introduces the following changes:

• Touch support in presentations.
• Keyboard shortcuts "A" (view all) and "=" (restore current frame) when playing a presentation (#495)
• Updated translations.
• Package in RPM format
• Bug fixes (#496, #514, #517, #535)

Under the hood, Sozi 21.08 is built with Gulp instead of Grunt. While most Sozi users are not directly concerned with this change, it is still possible that bugs have been introduced in the process.

This release is distributed only for 64-bit platforms. If you think you need a 32-bit version, please join the discussion #521 on this topic.