The changes are based on an analysis done with include-what-you-use.
Replace also some standard header files by the corresponding
standard C++ header files.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Remove unneeded include statements, remove conditional statements and
replace the remaining assert.h by their standard C++ variant cassert.
Signed-off-by: Stefan Weil <sw@weilnetz.de>