make switchInput themable

[AshesITR]

closes #452

Upgraded bootstrap-switch to 3.4 and tested the changes interactively in shinyWidgetsGallery()
devtools::check() also runs fine.

I also added .idea to .gitignore and .Rbuildignore.
.idea contains local PyCharm project settings, similar to .Rproj.user for RStudio.

[AshesITR]

The failing check (ubuntu 16.04) seems unrelated to this PR.

[pvictor]

Nice work @AshesITR ! 👍
Thank you very much!

Victor

[pvictor]

I submit to CRAN and forgot to add you in NEWS, sorry 😞

[ncuriale]

with this change, i am unable to change the button size to "mini". even though data-size in the html is set as mini, the bsswitch classes are undefined. any idea here?

shinyWidgets::switchInput(inputId` = ns("spread_disabled"),
                                      inline = TRUE,
                                      label = "Spread",
                                      onLabel = 'Disabled',
                                      offLabel = 'Enabled',
                                      onStatus = 'danger',
                                      offStatus = 'primary',
                                      size = "mini", 
                                      value = FALSE)
```

![image](https://user-images.githubusercontent.com/23648811/151838618-13bba0f5-4267-4c15-9cf9-fc76b07186f1.png)

[AshesITR]

Can you try on the current master branch, @ncuriale ?
It seems to have been fixed by #464 (we downgraded bsswitch to 3.3.4 from 3.4 in that PR).

If the issue still remains, I recommend opening a new issue with a reproducible example.
cc @pvictor do you know whether #464 made it to CRAN? If not, maybe a minor bugfix release would be nice.

[ncuriale]

yep looks like the downgrade solved the problem - the current master branch is working as expected. thanks

[pvictor]

Not yet on CRAN! I will submit a release by the end of the week!