[version a3.20] Small demo update

Thank you everyone for the warm reception so far! We hope you've enjoyed your time with dirtbag MAHJONG!

While most major changes will come with the full release, we've already made a couple small updates based on easily actionable feedback, as well as some bug fixes.

Bug fixes:

• Fixed an issue where if you mashed calls fast enough at specific times you could make the game softlock or crash (or on ron/tsumo, get an ungodly amount of points)
• Fixed an issue with fu calculation that would lead to sometimes incorrectly detecting or failing to detect pinfu
• Fixed an issue where using R1/RB/R on gamepad to tab to the right end of the hand would sometimes fail to do anything
• Fixed an issue where sometimes the wrong tiles would display in some yaku examples in the text guide
• Fixed an issue where you could use the "end game" button to quit out of the interactive tutorial before the tutorial was actually over
• Fixed an issue where controller prompts would sometimes appear in the interactive tutorial when playing with a mouse
• Fixed an issue where somehow no one on the team caught that 224m was a complex wait during the interactive tutorial (it's 225m now)

Interface changes:

• Added pages to the dirtbag guide to make the information for all the characters and their kits always available from the main menu regardless of which character was randomly selected for free play
• Added an extra screen between the end of the story intro and the start of the first game to explain Vren's kit

Known Issues:

• Swap calling is currently allowed and shouldn't be
• The shanten counter sometimes fails to display the correct number (typically at 3+ shanten)
• No one on the dev team knows how to play mahjong