Initial support. Alignment and border creation is fixed and is
consistent in considering the escaped table separator as part of the
column.
TODO :
* Fix syntax to reflect the above.
* Fix cell definition, motion & formula engine to incorporate this.
In order to use vim table mode over vimwiki native table formatting
support you need to add the following vimwiki settings to your vimrc :
```vim
let g:vimwiki_table_mappings=0
let g:vimwiki_table_auto_fmt=0
```
Since realigning doesn't work well in insert mode, I have removed auto
align feature for it. Auto align will now kick in once you have made
changes and get back to normal mode.
This is for better experience with auto align, we override the
updatetime with the value of the configuration g:table_mode_update_time.
Once table mode is disabled prior defaults are restored.
We now have support for center alignment, simply add a header border
with the `g:table_mode_align_char` as both the first and the last
character so it would look something like `+:.....:+` to center align
the column values.
* Fixed tablemode#spreadsheet#cell#SetCell() to accommodate the fact that we
can have borders anywhere in the table. Using
tablemode#spreadsheet#LineNr() to get get the line of the actual row
in the table.
* Fixed tablemode#spreadsheet#LineNr()
Added tablemode#logger#log && g:table_mode_verbose
Use logger wherever needed for logging general things, in future we can
scale this to do more things like write to a log file for debugging. It
uses g:table_mode_verbose to determine whether or not to actually log
the message.
Added a mapping `<Plug>(table-mode-sort)` which is mapped by default to
`<Leader>ts` that sorts the current table by the column in which the
cursor is currently.
Also added `TableSort` command that gives you a little more control over
the sorting, you can pass in additional :sort flags like u, i, n etc and
also use it with a `!` to sort in reverse order.
Altered table mode behavior such that if there is a header line, i.e.
the first line of the table is separated by a border with the rest of
the table, then it is not taken into account for formulas and cell
arithmetic
