update elements and fix some bugs

lib/src/prism/components/prism-tcl.js

+Prism.languages.tcl = {
+        'comment': {
+                pattern: /(^|[^\\])#.*/,
+                lookbehind: true
+        },
+        'string': /"(?:[^"\\\r\n]|\\(?:\r\n|[\s\S]))*"/,
+        'variable': [
+                {
+                        pattern: /(\$)(?:::)?(?:[a-zA-Z0-9]+::)*[a-zA-Z0-9_]+/,
+                        lookbehind: true
+                },
+                {
+                        pattern: /(\$){[^}]+}/,
+                        lookbehind: true
+                },
+                {
+                        pattern: /(^\s*set[ \t]+)(?:::)?(?:[a-zA-Z0-9]+::)*[a-zA-Z0-9_]+/m,
+                        lookbehind: true
+                }
+        ],
+        'function': {
+                pattern: /(^\s*proc[ \t]+)[^\s]+/m,
+                lookbehind: true
+        },
+        'builtin': [
+                {
+                        pattern: /(^\s*)(?:proc|return|class|error|eval|exit|for|foreach|if|switch|while|break|continue)\b/m,
+                        lookbehind: true
+                },
+                /\b(elseif|else)\b/
+        ],
+        'scope': {
+                pattern: /(^\s*)(global|upvar|variable)\b/m,
+                lookbehind: true,
+                alias: 'constant'
+        },
+        'keyword': {
+                pattern: /(^\s*|\[)(after|append|apply|array|auto_(?:execok|import|load|mkindex|qualify|reset)|automkindex_old|bgerror|binary|catch|cd|chan|clock|close|concat|dde|dict|encoding|eof|exec|expr|fblocked|fconfigure|fcopy|file(?:event|name)?|flush|gets|glob|history|http|incr|info|interp|join|lappend|lassign|lindex|linsert|list|llength|load|lrange|lrepeat|lreplace|lreverse|lsearch|lset|lsort|math(?:func|op)|memory|msgcat|namespace|open|package|parray|pid|pkg_mkIndex|platform|puts|pwd|re_syntax|read|refchan|regexp|registry|regsub|rename|Safe_Base|scan|seek|set|socket|source|split|string|subst|Tcl|tcl(?:_endOfWord|_findLibrary|startOf(?:Next|Previous)Word|wordBreak(?:After|Before)|test|vars)|tell|time|tm|trace|unknown|unload|unset|update|uplevel|vwait)\b/m,
+                lookbehind: true
+        },
+        'operator': /!=?|\*\*?|==|&&?|\|\|?|<[=<]?|>[=>]?|[-+~\/%?^]|\b(?:eq|ne|in|ni)\b/,
+        'punctuation': /[{}()\[\]]/
+};