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

decompiler/ObjectFile/LinkedWord.h

@@ -1,5 +1,13 @@
 #pragma once
 
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#elif defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+#endif
+
 /*!
  * @file LinkedWord.h
  * A word (4 bytes), possibly with some linking info.
@@ -152,3 +160,9 @@ class LinkedWord {
 };
 
 }  // namespace decompiler
+
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#elif defined(__clang__)
+#pragma clang diagnostic pop
+#endif