Code cleanup of SiSpacePointsSeedTool_xk package (ATLASRECTS-3037)

Code cleanup of SiSpacePointsSeedTool_xk package

• Use ATH_MSG macros.
• Use static_cast.
• Use range based for loop.
• Add space after if, for and while.
• Change if-else style.
• Change indentation.
• Remove space after ;
• Add virtual to inherit methods.
• Fix array size 593 -> 583.
• Move long inline methods to the cxx files.
• Change protected to private.
• Replace std::endl by endmsg.
• Use constexpr.
• Use forward declaration.

RunTier0Tests.py was fine. RunTier0Tests.log