pango: Remove unused format specifier
Render after reading stdin
This allows seeing option list without doing any input, like in original dmenu.
Drop render_frame on surface_enter
Fix crash when some line contains %
Fix potential buffer overflow
Calling strncpy where the size of the string to copy is equal to the
size of the destination can potentially lead to a buffer overflow. To
fix this, copy only what is needed with memcpy, and explicitly terminate
the string with a null character.
Fix buffer size not divisible by scale
docs: Document new bindings
README: add contributing section