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

My build of nnn with minor changes

Arun Prakash Jana 4f6f1a59d3 Fix #338 : export current file as $NNN		pirms 5 gadiem
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.clang-tidy	Increase function length	pirms 5 gadiem
dbg.h	nnn as file manager: more changes	pirms 6 gadiem
nnn.c	Fix #338: export current file as $NNN	pirms 5 gadiem
nnn.h	Key ^N replaces ^T to toggle nav mode	pirms 5 gadiem