:lipstick: Deprecate backspaceToBeginningOf{Word,Line}

Rename functions `backspaceToBeginningOfWord` to `deleteToBeginningOfWord` and
`backspaceToBeginningOfLine to `deleteToBeginningOfLine`.
Rename commands `editor:backspace-to-beginning-of-word` to
`delete-to-beginning-of-word` and `editor:backspace-to-beginning-of-line` to
`editor:delete-to-beginning-of-line`.

Fix #1791
:memo: Add more Emoji to the contributing guide

Suggest Emoji for:
 - Fixing something on Mac OS
 - Fixing a bug
 - Burning whitespace
 - Fixing the CI build
 - Adding tests
 - Refactoring
 - Security
Use :apple: for Mac OS specific bugs
Use :fire: emoji for general deleting of code
Remove :recycle: from the emoji in CONTRIBUTING.md
Upgrade to find-and-replace@0.102.0
Upgrade to go-to-line@0.20.0
Upgrade to language-sass@0.11.0
Upgrade to find-and-replace@0.103.0
Upgrade to bracket-matcher@0.34.0
Upgrade to fuzzy-finder@0.51.0
Upgrade to find-and-replace@0.104.0
Upgrade to language-html@0.22.0
Upgrade to find-and-replace@0.105.0
hide the cursor with cursor-hidden class rather than element.style
merge conflict
Fix subscription leak when ~/.atom/styles.less is present running specs
Merge pull request #2213 from dyross/dyr-hide-cursor-nicely

Hide the cursor with cursor-hidden class rather than element.style
Fix failures running config specs locally
Fix another subscription leakage associated with theme manager specs