Add lexer for MediaWiki Wikitext (#2373)

Author: diskdance

AUTHORS

@@ -265,5 +265,6 @@ Other contributors, listed alphabetically, are:
 * Martin Fischer -- WCAG contrast testing
 * Marc Auberer -- Spice lexer
 * Amr Hesham -- Carbon lexer
+* diskdance -- Wikitext lexer
 
 Many thanks for all contributions!

pygments/lexers/_mapping.py

@@ -533,6 +533,7 @@
     'WebIDLLexer': ('pygments.lexers.webidl', 'Web IDL', ('webidl',), ('*.webidl',), ()),
     'WgslLexer': ('pygments.lexers.wgsl', 'WebGPU Shading Language', ('wgsl',), ('*.wgsl',), ('text/wgsl',)),
     'WhileyLexer': ('pygments.lexers.whiley', 'Whiley', ('whiley',), ('*.whiley',), ('text/x-whiley',)),
+    'WikitextLexer': ('pygments.lexers.markup', 'Wikitext', ('wikitext', 'mediawiki'), (), ('text/x-wiki',)),
     'WoWTocLexer': ('pygments.lexers.wowtoc', 'World of Warcraft TOC', ('wowtoc',), ('*.toc',), ()),
     'WrenLexer': ('pygments.lexers.wren', 'Wren', ('wren',), ('*.wren',), ()),
     'X10Lexer': ('pygments.lexers.x10', 'X10', ('x10', 'xten'), ('*.x10',), ('text/x-x10',)),