Fix Makefile
Reogranize repo, each project in its own directory

Also tune Makefile for USBasp programmer
Add C support, allow to specify device in Makefile
Explicitly define C building rule, allow extra depends (headers)
Don't specify USB device, avrdude finds it automatically
Add WIP clock project (seven segment indicator + DS1307 clock communication)
Working byte transmission
Clock is working
Calculate and display program size
Add routines for reading/writing strings via 2wire interface, add panic()
Depend on makefiles as well, as they may change depends list and compiler flags
Remove unused functions to save space
Fix standard
Remove useless delays
Optimize byte sending
Optimize by reusing function
Not sure if this delay is needed, but add for safety
Save 4 more bytes
inline init functions as they're likely to be called only once
Reuse variable