ufmt revised and extended

Changed

• macros and tfmt now have the same version and changelog as they are linked to each other
• tests can now be executed with and without feature std
• macros: separation of lib.rs into lib, parser, write_gen and debug_gen
• internal traits DisplayFormat, Display revised
• get rid of unitialised wherever possible - replace unitialised with Maybeuninit
• Documentation improved,

Added

• traits DisplayFormatted and DisplayPadded
• binary and octal formatting
• float formatting
• padding
• source code and performance chart for size and cycle measurement