Added sniffs for the multiple @throws and use statements

Code sniffer fixes and additions:
 * Multiple @throws should not be stopped except if the thrown class is not found in the tokens 
 * White spaces between use statements is no longer allowed.
 * Can not import ( "use" ) a class more than one.
 * A singal white space is now allowed between the use keyword  and class imported no more or less.

A24Group/Triage#1820