Began SuppressWarnings Overhaul

Fixed: Removed some unnecessary SuppressWarnings annotations, added the first checks and commented the annotations.
Removed Return Type Parameter From FunctionDefinitionFactory

Removed: The method for creating function definitions without an initial executor in the FunctionDefinitionFactory no longer needs the return type of the function as a parameter. The runtime seems to cast the resulting return type <Object> into the one which is needed.
Map Support for SizeUtil

Added: SizeUtil.getSize() now also iterates over map entries and returns the total size of all their keys and values.
Added Configuration Class for Easy Configs

Added: A configuration class which is heavily inspired by UNIX configuration files. Configuration entries (rows or lines) are customized for different purposes. For example, a User class could be a ConfigurationEntry with different properties, like the name or the groups the user is a member in. Those properties are also called "columns" and can be edited in an external editor later on.
Removed "abstract" modifier from ConfigurationEntry

Removed: The ConfigurationEntry class shouldn't be abstract because it doesn't has any abstract methods.
Fixed: Added a missing empty line (style issue).
Changed the user system to configuration entries

Added: Users and groups are now configuration entries, so they can be used in configuration files.
Removed: The user manager and the user syscalls.
Note: This commit might cause some compilation errors.
Added FileSystemModule

Added: The FileSystemModule is much like the old FileSystemManager and manages different file systems. There is no program doing that thing because programs require the file system to be accessible.
Fixed the OperatingSystem class

Fixed: Added some missing imports to the OperatingSystem class.
Removed: The TODO comment about replacing the operating system with processes.
Moved some tests into correct packages

Fixed: Moved many test into correct packages.
Added: Split up the byte & speed unit tests.