COMMONS-354: [CKEditor] Remove SCAYT addon

Fix description:
* Remove the codes of SCAYT and WSC plugins
* Remove the configuration of these plugins in eXoConfig.js

COMMONS-354: Restore the folder of scayt and wsc

COMMOMS-354: Remove scayt and wsc in eXoConfig

COMMONS-354: Update indention
Merge commit '30d6b6b620b9a7603f0e8e76875aeb3fb0488a22' into HEAD