Use media endpoint for profile media tab

This bypasses "search" rate limits. It now includes media beyond
images and videos (eg. YouTube links are "media"), but the old
behaviour can be restored by clicking search, then filtering "Media"
and excluding retweets and replies.

src/api/utils.nim

@@ -1,6 +1,7 @@
 import httpclient, asyncdispatch, htmlparser
 import strutils, json, xmltree, uri
 
+import ../types
 import consts
 
 proc genHeaders*(headers: openArray[tuple[key: string, val: string]];
@@ -52,3 +53,11 @@ proc fetchJson*(url: Uri; headers: HttpHeaders): Future[JsonNode] {.async.} =
     result = parseJson(resp)
   except:
     return nil
+
+proc getLastId*(tweets: Result[Tweet]): string =
+  if tweets.content.len == 0: return
+  let last = tweets.content[^1]
+  if last.retweet.isNone:
+    $last.id
+  else:
+    $(get(last.retweet).id)