Monika would be unhappy with this release, but it's better than nothing

Gameplay Changes

A large number of topics / events / dialogue have been updated to use the new sprite codes.
Shortened the amount of time a topic must wait before being shown again from 24 hours to 6 hours.
Pool unlocks are now pooled so unlocks are no longer lost forever. See #1813 for more info.
Anniversary events now trigger at midnight on the day of, instead of 3AM.
Added additional words to Hangman
The Good Evening and Good Morning prompts kind of follow the settings you have for sunrise / sunset. This still needs more work, though.

Fixes

Typofixes
Blush appearing in the wrong place on leaning poses has been removed for now.
disable_esc / enable_esc work properly now.
Hotkeys are now disabled in the Import DDLC Save Data workflow.
Monday morning greeting actually fixed this time.
Fixed some unusual quit sequences in the opendoor greeting.
Fixed some topics that were not getting unlocked after being de-randomed.
Fixed a bug in the moniano where PianoNoteMatches consisting of a single note broke everything.
monika_explain should be unlocked this time, I hope.
Fixed Kizuna AI topic improperly unlocking.
Fixed Calendar crash when going too far into the future or past.
Hitting M in the music menu now properly closes the menu.
Lightly optimized dialogue sequences. If you're getting lag mid-dialogue, you should be getting somewhat less lag now.
Fixed Calendar overlay disappearing in certain sequences.

Added special datetime related functions that can set a datetime's time values to midnight or 3am.
Added shield functions that handle blocking / unblocking certain levels of user input. See zz_shields for more info.
Added overlay functions that handle hiding / showing certain overlays. See zz_overlays for more info.
allow_dialogue is gone. Now dlg_workflow in the mas_globals store is True when we are in dialogue, but this variable does not control any UI.
Separated hotkey logic from the functions they executed so the hotkey buttons can use the same functions. See zz_hotkeys for more info.
Spaceroom zorders are now constants MAS_MONIKA_Z and MAS_BACKGROUND_Z, which are 10 and 5, respectively.
Topics can now request to be derandomed by returning "derandom". A topic can request multiple actions by delimiting them with |.
There are a variety of state vars that control if certain UI is visible / enabled. See the respective rpy for more info.

A new sprite-helper tool has been adding to the repo, in the tools/ folder. This does 2 things:
1. Generates a list of all the sprite codes that are available.
2. Checks if all sprite codes used in the rest of the files exist.
- This tool is used in travis builds and will cause builds to fail if they use a sprite code that doesn't exist. If a sprite code you're using doesn't exist, it's not a big deal, and we'll probably add it for you if it's not a banned expression.
- The tool can be executed by running python toolsmenu.py. This is written with py2 in mind, but it might work in py3.