Why does Omniknight have 62 shovels?

Question

The ESL One Birmingham Dota 2 tournament is now underway, and while watching some of the games I noticed new icons above the usual hero abilities in-game.

Specifically, there's a row of 6 new icons or buttons above each hero's QWER skills. The first four icons have numbers next to them which seem to vary from hero to hero. Here's an example I took from a recent game:

What are all of these new icons and what do they mean?

Answer 1

Those are consumable items and actions available with purchase of The International Battlepass 2019.
From left to right, they are:

• Trusty Shovel, used to dig up treasures such as Battle Points or the "cosmically-rare" Honey Heist Baby Roshan courier.
• Silly Monkey, which cheers for the player's last hits and denies, and flings poo at enemy heroes attacking the player (purely cosmetic).
• War Drums, which plays a sound when attacked. Note that this item can currently activate on-hit effects such as Templar Assassin's Psi Blades spilling, and Enigma's Eidolon's multiplication, so it is usually banned in tournaments.
• Snake Balloon, which floats around and bounces away from heroes.
• High Five; exactly what it sounds like. Can be used with allies or enemies.
• Avatar Banner, which plants a banner with an image of the player's hero or Steam avatar.