Allow parentheses in certain links

Only links with either matching, or open LEFT parentheses are allowed. These are the same rules that github use for this as well.

https://cdn.discordapp.com/attachments/363049725374758921/662487292564340766/unknown.png

ui/util/remark-lbry.js

@@ -2,7 +2,7 @@ import { parseURI } from 'lbry-redux';
 import visit from 'unist-util-visit';
 
 const protocol = 'lbry://';
-const uriRegex = /(lbry:\/\/)[^\s()"]*/g;
+const uriRegex = /(lbry:\/\/)[^\s"]*/g;
 
 const mentionToken = '@';
 const mentionTokenCode = 64; // @
@@ -78,13 +78,32 @@ function tokenizeMention(eat, value, silent) {
   return validateURI(match, eat, self);
 }
 
+function onlyMatchingParens(string) {
+  if (!string) return null;
+  let parens = 0;
+
+  let i;
+  for (i = 0; i < string.length; i++) {
+    switch (string[i]) {
+      case '(':
+        parens++;
+        break;
+      case ')':
+        parens--;
+        break;
+    }
+    if (parens < 0) break;
+  }
+  return string.slice(0, i);
+}
+
 // Generate a markdown link from lbry url
 function tokenizeURI(eat, value, silent) {
   if (silent) {
     return true;
   }
 
-  const match = value.match(uriRegex);
+  const match = onlyMatchingParens(value.match(uriRegex));
 
   return validateURI(match, eat);
 }