Fix to line follower

The line follower should work better on reflective tape, like electric tape.

v1.2.2: Merge pull request #4 from CleoQc/thp

fix grouping for "following line" block

THP sensor

Merge pull request #2 from CleoQc/thp

Add "Add-On" next to outside sensor categories

v1.1.3

translating strings

v1.1.1

translating strings

v1.1.0

Formatting

Fix trimming

v0.1.3

bumped to v0.1.3

v0.1.2

check your json

v0.1.1

Update pxt.json

v0.1.0

Use groups, and weight