finch.toml, threads and atomics, finch fmt, C++ files, struct #defines, a struct variable given for its ptr

- finch.toml: name, entry, paths, include, links, libdirs, cflags, ldflags, and [target.windows] etc.;
  finch run / build / test with no file use its entry
- import thread: spawn, join, mutex, cpus; atomic_add/sub/load/store/swap/cas built in
- finch fmt [--check]: indentation by { }, trailing spaces, empty lines; also as LSP formatting
- link "x.cpp" (or in finch.toml): built with the C++ compiler, which then links (FINCH_CXX)
- #define RAYWHITE (Color){ 245, 245, 245, 255 } imports as a Color
- push(body) where push takes ptr[Body]: the same as push(addr(body))
- --target android (NDK clang from ANDROID_NDK_HOME, -llog)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016GzNP6r8dg6WDxUVZy8wjL

tests/tool/project/finch.toml

@@ -0,0 +1,14 @@
+# a project: finch run / build / test here need no file and no flags
+name = "mygame"
+entry = "src/main.fch"
+paths = ["src"]
+include = ["native"]
+links = [
+    "native/glue.cpp",     # C++, built with the C++ compiler
+]
+cflags = ["-DGLUE_BASE=40"]
+
+[target.linux]
+links = ["m"]
+[target.windows]
+links = ["ws2_32"]