Before the output looked like this:
pxh> logger statusINFO  [logger]   Running
INFO  [logger]   Wrote 0.13 MiB (avg  0.72 KiB/s)
INFO  [logger]   Since last status: dropouts: 0 (max len: 0.000 s), max used buffer: 7176 / 12288 B

remove unnecessary replay fields

This reverts commit a9a0759d.

This only removes one printfs, nothing fancy.

Sensors app: Use two parameters to convert battery current and voltage to make configuring custom frames easier

px4_task_exit doesn't seem to be available for NuttX, so it had no
effect and broke the init because the return values of the tasks were
wrong.

This moves printfs to PX4_INFOs.

Instead of having separate log functions for NuttX and POSIX, this now
switches everything to px4_log.h and PX4_INFO/WARN/ERR/DEBUG.

Also, the call mostly used is now a static inline function instead of a
macro which lead to a big increase in flash size for STM32.

If a text editor creates hidden save files, those will get copied into
the ROMFS. This is now fixed by deleting hidden files.

Also, the there was some available potential by removing the leading
whitespace.