Combined PRs into large update

[timothyschoen]

Work in progress to take some work away from @agraef for the next update.

I've merged most of the opened PRs into a new branch, resolving conflicts and adding missing plugdata implementations if needed. It includes:

#84: SVG rendering by @timothyschoen
#82: Makefile improvement by @umlaeute
#80: Clock deprecation fix by @ben-wes
#79: Github actions runner fix by @ben-wes
#77: Property menu support by @charlesneimog
#76: Fix compilation against new Pd version by @ben-wes
#70: Add mouse enter/exit callbacks by @ben-wes
#69: Fix path:close() documentation error by @ben-wes
#66: Make some gfx arguments optional by @ben-wes
#65: Add alignment feature to text drawing by @ben-wes
timothyschoen#7: Fix missing return value by @KottV

On top of that:

• plugdata fixes:
  • Multi-instance now runs with a true independent lua instance per Pd instead, instead of using lua threads
  • Ported new property menu feature
  • Ported new text alignment feature
  • Ported mouse enter/exit callbacks
• Cleaned up properties implementation
  • Remove unused variables and unnecessary checks
  • Moved to separate file, since it works independently from pdlua graphics
  • Also allow properties on non-gui objects
  • Fix properties dialog title
  • Added float/int/combo property options
  • Fix properties button greying out when no properties() function is available
  • Make properties "apply" behaviour like other Pd property dialogs
• Added option to render images (using stb_image on pd)
• Added runtime choice between Lua and LuaJIT (chosen based on .pd_lua or .pd_luajit filename)
• Fixed Github Actions building with UCRT instead of MSVCRT (causing crashes on Windows when reading files)
• Fixed glitches when pdlua graphics objects get recreated on the same address as a previous pdlua object
• Fixed bug in rounded rectangle drawing on pd-vanilla
• Small code style fixes
• Updated to Lua 5.5
• Added documentation for new features

Planned:

• Port features to purr-data
  • SVG rendering
  • Image rendering
  • Mouse enter/exit
  • Text alignment
  • Properties panels
    • Basics are implemented, though the UI could be better

I'm aware that this is gonna be a big set of changes. To ensure stability, I was hoping to get some assistance with testing from @ben-wes and @charlesneimog, once I get this out of the draft stage.

[timothyschoen]

I've tested this quite thoroughly on macOS/Windows/Linux with pure-data and plugdata, everything seems to work now. I'd say it's ready for further testing (if @ben-wes, @charlesneimog and @agraef have time soon).

Apart from all the new features, there's a few bugs fixed here too, it should be more stable than the last release.

[ben-wes]

... quickly tested my everyday object show~ as luajit on 4f893ac. i'm really impressed that this just works (and also quite a bit faster - even with vanilla's drawing restrictions)!

the dualsense controller display also works. tomorrow, i'll have a more detailed look at the help files. thank you so much for your work on this!

[timothyschoen]

Ok, actually done for real now :)

Here's a test suite you can use to verify all the new features work, both under Lua 5.5 and LuaJIT:

test-pdlua.zip