remove tracy, mimalloc, enet subprojects; now it's just enet.h

todo/playdate.md

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+# Playdate SDK notes
+
+Playdate should compile with playdate.cross
+Check for 'pdc' to see if it's available
+If it is, use playdate.cross to compile it and everything else
+Do not include main; instead, actors should receive messages from the playdate SDK
+pdc is used to bundle the compiled game's assets; playdate filesystem only can access files inside that bundle
+
+Simulator dylib is lpatform specific, bundled only to allow it to load into the simulator; doesn't ship to playdate
+pdex uses flags from playdate.cross
+
+Example with meson:
+pdx = custom_target('pdx bundle',
+  output: 'GameOfLife.pdx',
+  command: [join_paths(env['PLAYDATE_SDK_PATH'], 'bin', 'pdc'), 'Source', '@OUTPUT@'],
+  input: [elf, sim_dylib])
+
+
+sim_dylib = custom_target('simulator dylib',
+  output: 'pdex.dylib',
+  command: ['clang', '-dynamiclib', '-DTARGET_SIMULATOR=1', '-o', '@OUTPUT@', 'main.c', 'setup.c'],
+  build_by_default: true)
+
+elf = executable('pdex', ['main.c', 'setup.c'],
+  install: false,
+  c_args: device_c_args,
+  link_args: device_link_args)