* Search mode horizontal view
Enabled by setting `experimental.horizontal_search = true`
* use stylua
* move to a floating window instead of abusing status line
* pass all tests
* rework
1. rename entries view file and memeber to wildmenu_entries_view
2. move config to config.view.entries
3. support both in insert mode and cmdline
4. make separator configurable by config.view.separator
* rearange wildmenu config
Changed config to:
```lua
view = {
entries = {name = 'wildmenu', separator = '|' }
},
```
* allow view.entries to be either a literal string or a table
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