try_emo_ji() is a top-level helper (a lexical sibling of the Shiny
server closure), so `input$emoji$name` was unbound there and the
tryCatch() silently swallowed the error, making the 'try raw name
first' branch dead code. Use the `name` parameter, which already
holds input$emoji$name (passed by the caller).

Found via ry v0.6.1 RY010 (unbound-variable).

for older version of rstudioapi

plus datatable tweaks and improvements

- Improve documentation
- UI now variable, server is a function
- Export ermoji_*

This seems to match GitHub etc. better than emo::jis$name