build: get rid of clang-cl in favor of actual clang among other things (#1589)

* git: ignore vs build dir

* cmake: ditch `clang-cl` on windows in favor of actual `clang`

* build: suppress a significant number of warnings

* build: adjust workflows and vendor nasm

* docs: update docs to remove `clang-cl` mentions

* build: fix some copy-paste mistakes in the linux build

* build: remove C++20 compat warnings as that is useful if we want to upgrade

game/mips2c/functions/collide_cache.cpp

@@ -1,3 +1,11 @@
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
+#elif defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-but-set-variable"
+#endif
+
 //--------------------------MIPS2C---------------------
 #include "common/dma/gs.h"
 
@@ -3274,4 +3282,8 @@ void link() {
 } // namespace method_9_collide_puss_work
 } // namespace Mips2C
 
-
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#elif defined(__clang__)
+#pragma clang diagnostic pop
+#endif