Version 0.0.95 beta 3

Here we go, after a bit lengthy wait - the next Quaternion beta! Quite a few changes since beta 2, the most notable being:

• There's no typo in the version number: as Quaternion approaches the feature set planned for version 0.1, the former 0.0.9.5 shall be known as version 0.0.95!
• (#421) Quaternion supports entering Markdown! Moreover, you can use both Markdown and formatted text introduced in the previous beta within the same message - just make sure to keep them separate and not one within another. By default, Markdown is off; use /md command to enter a message in Markdown, or add UI/auto_markdown to the configuration file/registry if you want to always be in Markdown mode (not exposed in the interface, while we're ironing out the wrinkles). Markdown support requires Qt 5.14 or newer (within Qt 5.x version - no Qt 6 support as yet).
• The timeline went through an overhaul, along with partial migration to Qt Quick Controls 2:
  • (#704; #712; #375) a few long-standing bugs fixed;
  • (#725) the scroll-to-bottom button, as well as the timestamp in the default layout, shifted to the right; the shuttle-dial scroller looks a bit less custom;
  • (#727, #687) the read marker QML code is entirely rewritten - the read marker transitions are more natural (that line actually shifts across events now), and there's a slight tint over read messages so that you could easily discern whether you're in "unread" or "read" area without the read marker on the screen; the read marker line also doesn't mysteriously disappear at redactions, reactions and edits ("aggregations", in Matrix tech lingo);
  • (#257/#729, thanks to @ddanilov) and speaking of the read marker, it's now just one "scroll to reader marker" button click away if it's off-screen.
• (#715, thanks to @krkk) When you remove the tag, its corresponding UI state (collapsed/expanded) is also removed from the configuration to prevent surprises if the same tag is introduced again sometime later.
• (#717, thanks to @aaronraimist) The macOS image now uses a higher quality icon

Known limitations and issues (both go from beta 2):

• (#732) Copy-pasting from the timeline may not work in some cases (it actually never quite worked, and this limitation might not hit 0.0.95).
• (#730) There's no "reset formatting" shortcut when the pasted formatted text (or a mention) is right at the end of the message. Pasting any unformatted text (even a whitespace) is a workaround for now.