Incsearch support for :global

[citizenmatt]

Well this PR is a great example of yak shaving. I wanted to modify one line in the ex text field change listener to add instanceof GlobalCommand so it would update highlights for the :global command, and, well, this PR happened instead. The big problem is that :global has a default range of the whole file, where (nearly) all other commands have a default range of the current line, and that wasn't easily added.

So, this PR refactors range handling to allow the :global command to have a different default range to the other commands. It improves and simplifies the API and uses the same terminology as Vim - a "range" is a collection of "addresses". An address evaluates to a line number, and can be an explicit number, such as 1 or 2, or a string like . for the current line, $ for the last line, 'a for a mark, etc., or even a search pattern. Addresses can also have +/- offsets. The range % is a collection of the first line to the last line in a file.

It also fixes a number of off-by-one errors; addresses are one-based, while IdeaVim internally is zero-based. This is particularly important because the address 0 is special. For the :[range]move {address} or :[range]copy {address} command, a value of 1 for {address} means move/copy to the line after the first line, while 0 means move/copy to the line before the first line. This {address} should not be confused with {count} in :[range]yank {count}, which is also 1-based, but should be treated as 1-based by IdeaVim.

As part of the refactoring, it fixes the following issues:

• Fixes off-by-one error in :[count]goto to go to the [count]th character in a file
• Fixes :[range]copy 0 to correctly copy to the line before the first line
• Fixes :>{count} and :<{count}
• Fixes correct end location of caret after various ex operations
• Fixes maintaining correct mode (i.e. Visual) when cancelling search entry
• Fixes clearing the output panel after :global command (VIM-2570)
• Fixes range containing 0 not being handled correctly, e.g. :0,$s/... (VIM-1137)
• Fixes range with missing last address, e.g. :1,d (VIM-992)
• Fixes incorrect value returned from line() script function when in Normal mode
• Fixes :[range]m. move to current line (VIM-2936)
• Reports correct Vim errors for invalid range, mark not set, etc.
• Add more tests and minor fixes for range, count, address and register in commands such as :copy, :move, :goto (goto character), :[range] (goto line), :delete, :join, :yank

Finally, of course, it adds 'incsearch' highlighting for the :global command (VIM-2891).

[citizenmatt]

Rebased and force pushed. There were some conflicts with recent changes to handling the ex text field, so the last 7 commits should be reviewed again. The conflicts highlighted a bug and a regression, which are also fixed in these last commits.

[AlexPl292]

Merged! Thank you!