Long strings get cut

[DragosMocrii]

For long string values, the value gets cut because the modal window does not allow horizontal scrolling. Either horizontal scrolling should be enabled, or the string value should wrap.

[baartch]

Possible solution #94 (sorry, I saw this issue to late)

[himself65]

the temporary patch https://github.com/TexteaInc/json-viewer/commit/6d10db32d98751d7c12845bbcb8eecf70aab9143

I'm thinking a better way to do this