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This patch unifies the patterns of using the 'Genode' and 'Libc' namespaces. Types defined in the 'internal/' headers reside in the 'Libc' namespace. The code in the headers does not need to use the 'Libc::' prefix. Compilation units import the 'Libc' namespace after the definition of local types. Local types reside in the 'Libc' namespace (and should eventually move to an 'internal/' header). Since the 'Libc' namespace imports the 'Genode' namespace, there is no need to use the 'Genode::' prefix. Consequently, code in the compilation units rarely need to qualify the 'Genode' or 'Libc' namespaces. There are a few cases where the 'Libc', the 'Genode', and the global (libc) namespaces are ambigious. In these cases, an explicit clarification is needed: - 'Genode::Allocator' differs from 'Libc::Allocator'. - 'Genode::Env' differs from 'Libc::Env'. - Genode's string functions (strcmp, memcpy, strcpy) conflict with the names of the (global) libc functions. - There exist both 'Genode::uint64_t' and the libc'c 'uint64_t'. Issue #3497