Emoji Autocomplete (#3433)

* Implemented emoji autocomplete.

* Changed emoji access url.

* Reverted vendor css to default, moved all style changes to _tribute.less

* Made no-results overwriteable, added missing autocomplete to edit issue field.

Signed-off-by: modmew8 <modmew8@gmail.com>

public/less/index.less

@@ -1,3 +1,4 @@
+@import "_tribute";
 @import "_emojify";
 @import "_base";
 @import "_markdown";