Fix dot-repeats showing noise on the cmdline

[tuurep]

Resolves #20

[tuurep]

Found out this breaks visual mode in weird ways, and sometimes shows this error message:

Error detected while processing function wordmotion#object:
line   16:
E471: Argument required: normal!
Press ENTER or type command to continue

vim-wordmotion/autoload/wordmotion.vim

Line 186 in 81d9bd2

execute 'normal!' visualmode()

[tuurep]

Easy immediate fix would be to use a <cmd> mapping only if it's not visual mode, force pushed that change above.

[tuurep]

Style change: converted space-indents to tabs to be consistent with the rest

[tuurep]

Obsessive style change: since you never capitalize your comments, I wanted to follow suit

Now there's nothing I want to add here

I suppose it would be possible to make the <cmd> mappings work with visual mode too but it would be a bigger refactor