+ sdk: added `fcut`, `fpad`, `fpoke` tools
* sdk: updated `zx7b` tool
* sdk: updated `README.md`
- hardware: removed old binaries of `fcut` tool
* updated some .bat-scripts to use SDK
* updated some copyright and licensing information
* renamed file `modflash/addcore.bat` into `modflash/addcores.bat`
* renamed file `modflash/addrom.bat` into `modflash/addroms.bat`
+ added proper licensing information to some files