Also supports `mapclear!` and `unmap!`
Moves parsing of the bang modifier to the parser so we can tell the difference between `map! foo bar` and `map ! foo bar`
E.g. `map foo bar` and `vmap foo baz` would only output one map for `foo` when calling `:map`. Now it will output all maps that match the ex command's modes. This change also improves the marker characters in the first column of map output.
This was needed when action keys were registered in a comma separated list in a single XML attribute string. Additional encoding was needed for angle brackets and commas. Registration has changed, and this is no longer needed
List is based on Vim's documentation, although not all digraphs are documented. Additional digraphs are added based on the output of `:digraphs`. These additional digraphs include some digraphs that produce the same character, so the code is updated to handle duplicates, with the same ordering/priority as Vim.
Extra digraphs include the Euro symbol (`=e` and `Eu`), quadruple prime (`4'`) and bullet (`oo`), amongst others.
Also removes a number of non-standard digraphs. The symbols generated don't match the descriptions. The code appears to be private use, so are not reliable. Once custom digraphs are implemented, they can be easily added back in `~/.ideavimrc`
Vim only use the `~` prefix if the encoding is "latin1". We can just treat it as though the encoding is Unicode, and match the other places we format printable characters. Note that for Vim, if `'display'` contains "uhex", then all unprintable characters are shown in hex, including control characters (`^C`, etc.). IdeaVim does not support the `'display'` option.
`OperatorArguments.mode` is the mode *before* the command was completed, rather than the current mode, which is non-obvious. E.g. for a command in Insert mode, it will still be Insert, and for a (simple) command in Normal, it will still be Normal. The only difference is that a command such as `dw` would be in Operator-pending before the command is completed. That logic is not required for this method, so it's safe to use the current mode.
This allows us to start to deprecate `OperatorArguments.mode`.
`OperatorArguments.mode` is the mode *before* the command is completed, so might be Visual, Operator-pending, Insert, etc. It's not immediately obvious this is the case, so we're going to deprecate `OperatorArguments.mode` to avoid confusion with `editor.mode`.
It's not required for this method because it's only called for Visual-block mode.
Register specific handlers for Operator-pending mode instead of relying on a runtime flag for behaviour. Also refactors and renames some arrow motion handlers.
It's easier to just look at mode. We don't need the additional check on command builder, because we can't be in OP_PENDING without pushing an operator action to the command builder
