1) Changed ToolArg class to abstract generic arguments of a tool

1) Changed ToolArg class to abstract generic arguments of a tool
2) Added FileArg class to abstract arguments which represent the path of a file
3) Changed the log method to EdkLog and the message format for flashmap, fwimage, gendepex, genfvimage, gensection, peirebase, strgather and vfrcompile tool. And changed these tools to use ToolArg and FileArg to keep their arguments.
4) Added more verbose message for OnDependency task
5) Changed MakeDeps tool to insert a file end flag. This is very useful when dependency check is broken occasionally
6) Cleaned the coding style of java code

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1519 6f19259b-4bc3-4df7-8a09-765794883524