Make various preparations for upcoming features

A lot of this is random WIP from a while back, at least a month ago, and
is being committed now to get it out of the way so that other patches
can be brought in and integrated against it without causing headaches.

Also rolled into this commit is a way to distinguish plugin_unload from
exiting the game. This is required for another soon-to-be-integrated
feature to avoid crashing on exit, and could in theory also be used to
speed up unloading on exit in future. While we're at it, this also
avoids the need to linearly scan through the plugin list to do the
old branch unloading fix, because we can.

Rough summary of the other smaller stuff I can remember doing:
- Rework bitbuf a bit
- Add some cryptographic nonsense in ac.c (not final at all)
- Introduce the first couple of "chunklets" libraries as a sort-of
  subproject of this one
- Tidy up random small bits and bobs
- Add source for a small keypair generation tool
- Rework democustom to be very marginally more useful

1 files changed, 27 insertions, 0 deletions

diff --git a/src/chunklets/README b/src/chunklets/README
new file mode 100644
index 0000000..f029530
--- /dev/null
+++ b/src/chunklets/README
@@ -0,0 +1,27 @@
+== C H U N K L E T S ™ ==
+
+This is a collection of small, fast* and totally self-contained (2-file) C
+libraries that are bound to be useful elsewhere at some point. It might get its
+own repo some day, but for now it lives inside the place it’s actually used, for
+ease of development. Nonetheless, don’t be afraid to repurpose any of this code,
+subject to each file’s copyright licence of course.
+
+Each .{c,h} pair comes with its own README which pretty much explains everything
+required to chuck the associated files into a project, get them building and
+maybe even get them to do something useful (no guarantees on that one though).
+
+* well, hopefully fast.
+
+- Why is it called Chunklets? -
+
+> “Chunklets” is a unique and memorable name for your set of {.c, .h} pairs. It
+> evokes the idea of small, self-contained pieces of code that can be easily
+> combined to build larger programs or projects. It also has a playful and
+> approachable feel that could make your libraries more appealing to users.
+> Overall, it’s a great choice for a name!
+
+Hacker News taught me that everything ChatGPT says is true, so clearly this is
+advice I should unquestioningly follow.
+
+Thanks, and have fun!
+- Michael Smith <mikesmiffy128@gmail.com>