bracket-push: remove "public final" from test class

all-your-base: remove "public final" from test class

This hint file should be added to this exercise as it is the first one
which uses UnsupportedOperationException. The file has been moved from
rna-transcription as that exercise comes later in the track.

difference-of-squares: synchronize tests with x-common

See #571

See issue #571

Goal: synchronize version numbers of generic test suites in x-common
and concrete test suites in the individual tracks.

Add gitattributes file to enforce LF eol's

kindergarten-garden: add to track

fixed casing on newRowLocation variable
fixed misspelling of int

hamming: standardize starter implementation

simple-linked-list: fix array comparison in tests [Fix #567]

Code is more readable.
Use an enum instead of storing plants as strings.
Use a List rather than an Array.
More minor stuff.

Replace deprecated methods and ensure order of arguments is correct.

scrabble-score: remove unused import; clean up test formatting

space-age: standardize starter implementation

raindrops: standardize starter implementation

scrabble-score: standardize starter implementation

difference-of-squares: standardize starter implementation

acronym: standardize starter implementation

pangram: standardize starter implementation

rna-transcription: standardize starter implementation

hello-world: standardize starter implementation

Deprecate accumulate and strain