Enable MA0070 and fix noncompliance

"Obsolete attributes should include explanations"

.global.editorconfig.ini

@@ -239,7 +239,7 @@ dotnet_diagnostic.MA0068.severity = error
 # Non-constant static fields should not be visible
 dotnet_diagnostic.MA0069.severity = silent
 # Obsolete attributes should include explanations
-dotnet_diagnostic.MA0070.severity = silent
+dotnet_diagnostic.MA0070.severity = warning
 # Avoid using redundant else
 dotnet_diagnostic.MA0071.severity = silent
 # Do not throw from a finally block

src/BizHawk.Client.Common/Api/Interfaces/IInputApi.cs

@@ -17,7 +17,7 @@ namespace BizHawk.Client.Common
 		/// See <see cref="DistinctKey"/> for keyboard key names, though some are overridden by <see cref="DistinctKeyNameOverrides"/> (check the source).
 		/// </remarks>
 		/// <seealso cref="GetPressedButtons"/>
-		[Obsolete]
+		[Obsolete($"consider using {nameof(GetPressedButtons)}/{nameof(GetPressedAxes)}/{nameof(GetMouse)}")]
 		Dictionary<string, bool> Get();
 
 		/// <returns>

src/BizHawk.Client.Common/lua/CommonLibs/InputLuaLibrary.cs

@@ -9,12 +9,12 @@ namespace BizHawk.Client.Common
 
 		public override string Name => "input";
 
-#pragma warning disable CS0612
 		[LuaMethodExample("local buttons_down = input.get();\nlocal is_b_down = buttons_down[\"B\"];\nif is_b_down and not was_b_down then console.writeline(\"B pressed\"); end\nwas_b_down = is_b_down;")]
 		[LuaMethod("get", "Returns a dict-like table of key/button names (of host). Only pressed buttons will appear (with a value of {{true}}); unpressed buttons are omitted. Includes gamepad axes ({{!axis.isNeutral}}, with sticks as 4 \"buttons\" suffixed {{\"Up\"}}/{{\"Down\"}}/{{\"Left\"}}/{{\"Right\"}}). Includes mouse buttons, but not axes (cursor position and wheel rotation). Unlike {{getmouse}}, these have the names {{\"WMouse L\"}}, {{\"WMouse R\"}}, {{\"WMouse C\"}}, {{\"WMouse 1\"}}, and {{\"WMouse 2\"}} for LMB, RMB, MMB, Mouse4, and Mouse5, respectively.")]
 		public LuaTable Get()
+#pragma warning disable CS0618 // the ApiHawk equivalent of this function is warn-level deprecated; Lua can't and shouldn't make that distinction
 			=> _th.DictToTable(APIs.Input.Get());
-#pragma warning restore CS0612
+#pragma warning restore CS0618
 
 		[LuaMethodExample("local mouse_buttons_down = input.getmouse();\nlocal is_m3_down = mouse_buttons_down[\"Middle\"];\nif is_m3_down and not was_m3_down then console.writeline(\"M3 pressed\"); end\nwas_m3_down = is_m3_down;")]
 		[LuaMethod("getmouse", "Returns a lua table of the mouse X/Y coordinates and button states. Table keys are X, Y, Left, Middle, Right, XButton1, XButton2, Wheel.")]