3rdparty/rcheevos: Bump to 3d01191 and move in-tree

 - aes and 3DS functions in hash.c removed, due to potential legal issues.
 - .github/test/validator directories removed, as they are unnecessary.

.gitmodules

@@ -21,9 +21,6 @@
 [submodule "3rdparty/zstd/zstd"]
 	path = 3rdparty/zstd/zstd
 	url = https://github.com/facebook/zstd.git
-[submodule "3rdparty/rcheevos/rcheevos"]
-	path = 3rdparty/rcheevos/rcheevos
-	url = https://github.com/RetroAchievements/rcheevos.git
 [submodule "3rdparty/libwebp/libwebp"]
 	path = 3rdparty/libwebp/libwebp
 	url = https://github.com/webmproject/libwebp

3rdparty/rcheevos/.editorconfig

@@ -0,0 +1,15 @@
+# More info: http://EditorConfig.org
+root = true
+
+# * here means any file type
+[*]
+end_of_line          = crlf
+insert_final_newline = true
+
+# latin1 is a type of ASCII, should work with mbcs
+[*.{h,c,cpp}]
+charset                  = latin1
+indent_style             = space
+indent_size              = 2
+trim_trailing_whitespace = true
+curly_bracket_next_line  = false

3rdparty/rcheevos/.gitignore

@@ -0,0 +1,65 @@
+# Prerequisites
+*.d
+
+# Object files
+*.o
+*.ko
+*.obj
+*.elf
+
+# Linker output
+*.ilk
+*.map
+*.exp
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Libraries
+*.lib
+*.a
+*.la
+*.lo
+
+# Shared objects (inc. Windows DLLs)
+*.dll
+*.so
+*.so.*
+*.dylib
+
+# Executables
+*.exe
+*.out
+*.app
+*.i*86
+*.x86_64
+*.hex
+
+# Debug files
+*.dSYM/
+*.su
+*.idb
+*.pdb
+
+# Kernel Module Compile Results
+*.mod*
+*.cmd
+.tmp_versions/
+modules.order
+Module.symvers
+Mkfile.old
+dkms.conf
+
+# Visual Studio files
+Debug/
+Release/
+*.user
+.vs/
+
+# Repository specific
+test/test
+test/galaga_nes.h
+test/smw_snes.h
+validator/validator
+.vscode/*