Immanuel/nnn: My build of nnn with minor changes - nnn

My build of nnn with minor changes

Arun Prakash Jana fe80d5aa9d Update key collision detection		5 lat temu
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.clang-tidy	Increase function length	5 lat temu
dbg.h	nnn as file manager: more changes	6 lat temu
nnn.c	Update key collision detection	5 lat temu
nnn.h	Implemented edit selection buffer (#345)	5 lat temu