Accepting c2x compilers (#10456)

* Add c2x compilers as acceptable arguments

* Update config UI with new c stds

* Remove c20

* Remove gnu20

* Fix typo

* Remove c20

* Remove gnu20

---------

Co-authored-by: Colen Garoutte-Carson <[email protected]>

Author: Bernardin-MS

Extension/c_cpp_properties.schema.json

@@ -36,10 +36,12 @@
                             "c99",
                             "c11",
                             "c17",
+                            "c23",
                             "gnu89",
                             "gnu99",
                             "gnu11",
                             "gnu17",
+                            "gnu23",
                             "${default}"
                         ]
                     },

Extension/package.json

@@ -572,10 +572,12 @@
               "c99",
               "c11",
               "c17",
+              "c23",
               "gnu89",
               "gnu99",
               "gnu11",
-              "gnu17"
+              "gnu17",
+              "gnu23"
             ],
             "markdownDescription": "%c_cpp.configuration.default.cStandard.markdownDescription%",
             "scope": "resource"

Extension/ui/settings.html

@@ -581,10 +581,12 @@
         <div class="section-text" data-loc-id="c.standard.description">The version of the C language standard to use for IntelliSense. Note: GNU standards are only used to query the set compiler to get GNU defines, and IntelliSense will emulate the equivalent C standard version.</div>
         <div>
             <select name="inputValue" id="cStandard" class="select-default">
+                <option value="c23">c23</option>
                 <option value="c17">c17</option>
                 <option value="c11">c11</option>
                 <option value="c99">c99</option>
                 <option value="c89">c89</option>
+                <option value="gnu23">gnu23</option>
                 <option value="gnu17">gnu17</option>
                 <option value="gnu11">gnu11</option>
                 <option value="gnu99">gnu99</option>