Signed-off-by: dylad <dylan.laduranty@mesotic.com>

With some minor hand-edits I used the following chain of commands:

```sh
git rm sys/include/net/gnrc/netdev.h
git grep --name-only -i netdev2 | \
        xargs sed -i -e 's/^\(NETDEV\)2\(.*\)\( [("]\)/\1\2 \3/g' \
                     -e 's/\(netdev\)2\(.*\)\( \/\*\*<\)/\1\2 \3/I' \
                     -e 's/\(netdev\)2/\1/gI'
git add -p
git commit --amend
git ls-tree --full-tree -r HEAD --name-only | \
        grep "netdev2" | xargs -I'{}' dirname '{}' | uniq | \
        grep "netdev2" | while read dir; do
                new_dir="$(echo "$dir" | sed "s/netdev2/netdev/g")"
                git mv -f "$dir" "$new_dir"
        done
git commit --amend
git ls-tree --full-tree -r HEAD --name-only | \
        grep "netdev2" | while read file; do
                new_file="$(echo "$file" | sed "s/netdev2/netdev/g")"
                git mv -f "$file" "$new_file"
        done
git commit --amend
git grep --name-only "\<drivers_netdev_netdev\>" | \
        xargs sed -i "s/\<drivers_netdev_netdev\>/drivers_netdev_api/g"
git add -p
git commit --amend
```

- added default parameters file
- let init() function use param struct
- named return values
- simplified init function
- sensor now active after init was called
- simplified return values

- unified auto-init to use same style as other SAUl devices
- make use of named return values
- added some asserts

Also change references in dependencies to the net/gcoap.h include.

This patch adds a driver for the jc42 compatible
temperature sensors. All sensors compatible with
jc42.4 should work. Examples include the mcp9808
and more.