Add grammar for execute commands and parser to identify possible next
tokens for the user's execute command input.
The grammar is given as a sequence of Tokens in each command's
definition. The parser parses the user's input according to this
grammar, and returns the tokens that could come next, if any.
Text attributes have been rewritten as bit flags, so for example instead of
"BoldUnderline" you'd have to define "Bold | Underline" in your theme
settings.
Requested in #21
They are just typedefs for the Selector widget. The API is kind of
messed up and this commit is part of the process of cleaning it up:
right now to use this, you check the is_done() method which if returns
true, the done() method executes the closure you defined when creating
the widget. The closure returns a UIEvent which you can forward
application-wide by context.replies.push_back(event) or handle it in
process_event() immediately.
Merge ui crate with root crate.
In preparation for uploading `meli` as a separate crate on crates.io.
Workspace crates will need to be published as well and having a separate
`ui` crate and binary perhaps doesn't make sense anymore.
Manos Pitsidianakis