#9 Refactor package and class-names

[Mario Linke]

Sorry, but for a better structure i must refactor the SOJO structure (by the version 0.3 is this allowed).

Details:

Core:

net.sf.sojo -> net.sf.sojo.core
net.sf.sojo.conversion -> net.sf.sojo.core.conversion
net.sf.sojo.conversion.interceptor -> net.sf.sojo.core.conversion.interceptor
net.sf.sojo.reflect -> net.sf.sojo.core.reflect

Common:

net.sf.sojo.util.object.common -> net.sf.sojo.common
test.net.sf.sojo.util.object.common -> test.net.sf.sojo.common

Navigation:

net.sf.sojo.util.object.navigation -> net.sf.sojo.navigation
test.net.sf.sojo.util.object.navigation -> test.net.sf.sojo.navigation

Interchange:

net.sf.sojo.util.object.common.Serializer -> net.sf.sojo.interchange.Serializer
net.sf.sojo.util.object.common.AbstractSerializer -> net.sf.sojo.interchange.AbstractSerializer
net.sf.sojo.util.object.common.SerializerException -> net.sf.sojo.interchange.SerializerException

Interchange - JSON:
-------------------
net.sf.sojo.util.object.json -> net.sf.sojo.interchange.json
net.sf.sojo.util.object.json.generate -> net.sf.sojo.interchange.json.generate
test.net.sf.sojo.util.object.json -> test.net.sf.sojo.interchange.json

Interchange - XML-RPC:
----------------------
net.sf.sojo.util.object.xmlrpc -> net.sf.sojo.interchange.xmlrpc
test.net.sf.sojo.util.object.xmlrpc -> test.net.sf.sojo.interchange.xmlrpc

CommonObjectSerializer:
-----------------------
net.sf.sojo.util.object.common.CommonObjectSerializer -> net.sf.sojo.interchange.object.ObjectSerializer
test.net.sf.sojo.util.object.common.CommonObjectSerializerTest -> test.net.sf.sojo.interchange.object.ObjectSerializerTest
net.sf.sojo.common.CommonObjectGraphWalker -> net.sf.sojo.common.ObjectGraphWalker
test.net.sf.sojo.common.CommonObjectGraphWalkerTest -> test.net.sf.sojo.common.GraphWalkerTest
net.sf.sojo.common.CommonObjectUtil -> net.sf.sojo.common.ObjectUtil
test.net.sf.sojo.common.CommonObjectUtilTest -> test.net.sf.sojo.common.ObjectUtilTest